# Engineer Kažimír

The difference between politicians-demagogues and reasonable person with at least primary education beautifully illustrated by the TV show example.

"Engineer" Kažimír says that during their tenure there was a large decline in the price of natural gas, price went from 0.46 €/m3 to € 0.0425/kWh. Calculate:

1. how many percent the price of gas has fallen theoretically, if we do not consider the unit in which the price shown.
2. Transform unit 1 kWh of energy to MJ
3. If you are considering a calorific value of natural gas was 3.91×107 J/m3, calculate how much MJ is released by burning one cubic meter of gas
4. What is the conversion factor combustion heat of natural gas to kWh?
5. Calculate how many percent dropped the price of gas when to consider the calorific value gas.

Mr. engineer Kažimír does not have a bit of common sense when comparing gas prices in €/kWh to the price quoted €/m3.

Prove fact that 1 cubic meter is 46 cents a kilowatthour and costs 4.25 cents, so it is the same price.

Correct result:

Gas prices fell numerically by:  90.8 %
1 kWh =  3.6 MJ
combustion of m3 of gas gives heat:  39.1 MJ
combustion of m3 of gas gives heat:  10.9 kWh
Gas prices fell by:  0 %

#### Solution:

$p = 100 \% \cdot (1-\dfrac{ 0.0425}{ 0.46}) = 90.8 \%$
$p_2 = 100 \% \cdot \dfrac{ 0.46 - 0.0425 Q_2}{ 0.46} \doteq 0 \%$

We would be very happy if you find an error in the example, spelling mistakes, or inaccuracies, and please send it to us. We thank you!

Tips to related online calculators
Need help calculate sum, simplify or multiply fractions? Try our fraction calculator.
Check out our ratio calculator.
Do you know the volume and unit volume, and want to convert volume units?

## Next similar math problems:

• Tennis balls
Can of tennis balls contains 3 balls per can and cost $7 how much will it cost for 36 tennis balls? • Six workers Six workers earned a total of CZK 12,600 per week on the construction site (5 working days). How much do 7 workers earn in 10 days with the same daily average salary? • Trio ratio Hans, Alena and Thomas have a total of 740 USD. Hans and Alena split in the ratio 5: 6 and Alena and Thomas in the ratio 4: 5. How much will everyone get? • Exchange rates If the Canadian dollar appreciated by C$0.005 relative to the US dollar, what would be the new value of the Canadian dollar per US dollar? Assume the current exchange rate was US$1 = C$0.907.
• Composite ratio
Jakub, Aneta, and Lenka divided 1342 USD in the ratio 5/2: 3/10: 1/4. How much did Lenka take?
• Apples
School kitchen bought 36kg apples for 12 kc/kg. How many kilograms of apples 1/4 cheaper can they buy for the same money?
• Supermarket
In a local supermarket, 3/5 kilogram of squid costs 156.00. How do 4 kilograms of squid cost?
• Michal
Michal has 2.90 per hour. How much does he earn during the week of the summer job?
• Three 43
Three brothers inherited a cash amount of 62,000 and they divided it among themselves in the ratio of 5:4:1. How much more is the largest share than the smallest share?
• Two discounts
The MP4 player cost 960 CZK, the price was twice gradually reduced in the ratio 4: 3: 3/2. How much did the player cost after the second discount?
• Twelve
Twelve students work on a week forestry brigade. One hundred spruces will receive x CZK, one hundred pine y CZK. How many receive each one students did in one day if they planted a total of 25,000 spruces per week and 30,000 pine trees? Express by express
• Babysitting
The amount that Susan charges per hour for babysitting are directly proportional to the number of children she is watching. She charges $4.50 for 3 kids. How much would she charge to babysit 5 kids? • Natural gas in kWh Gas consumption for 2017 was 11,301 kWh I paid 532 € How much 1 m3? • Hour salary You work for 4 hours on a Saturday and 8 hours on Sunday. You also receive a$50 bonus. You earn \$164. How much did you earn per hour?
• Pamela
Lara Pamela spends her salary of 3000 for food, clothing, recreation and savings, which are in the ratio of 48:20:15:37, respectively. How much does he spend for savings?
• Kilo candy
One kilogram of chocolate candy cost 10 euros. Kate buys 250 grams and had the 8 pack of candy. How much does cost one bonbon?
• Parcel 4
To send a parcel by messenger within city limits costs 60 cents for the first pound and 48 cents for each additional pound. What is the cost, in cents, of sending a parcel weighing p=4 pounds?