Expression of a variable from the formula + percentages - math problems

Number of problems found: 77

Demographics
The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase of population?
Finding the base
Find the unknown base of percent: 12.5 percent of what = 16?
What is
What is the annual percentage increase in the city when the population has tripled in 20 years?
Together m+w
Women 30%. Men are 360 more. How many are together?
Price increase
A 20 percent price increase meant a 90-crown raise. How many cost a product after?
Decibel
By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB?
Cube edges
If the edge length of the cube increases by 50%, how does the volume of this cube increase?
Sales off
The price has decreased by 20%. How many percents do I have to raise the new price to be the same as before the cut?
The price
The price of the land increased by 17%. What was the original price of the land if it now costs 46800 €?
Cube into sphere
The cube has brushed a sphere as large as possible. Determine how much percent was the waste.
Raspberries
Dano had 20 raspberries. John had 90% more raspberries than Dano. Determine how many raspberries have Dano and Juraj together.
Growth of wood
The annual growth of wood in the forest is estimated at 2%. In how many years will make the forest volume double?
Slow saving in banks
How long will it take to save € 9,000 by depositing € 200 at the beginning of each year at 2% interest?
Vacation
Tomas spent 60% of his savings for his weekly vacation. He was 32 € left. How many euros did he have before vacation?
Meat loses
Meat loses 18% of its weight by smoking. How much raw meat butcher used to manufacture 35 kilos of smoked?
Cuboid enlargement
By how many percent increases the volume of cuboid if its every dimension increases by 30%?
Former price
The price of an article is cut by 10%, to restore it to the former value, by what percent the new price must be increased?
Calf
The weight of the calf meat obtained is 65% of the total weight of live calves. What was the weight of a calf from which 285 kg of meat was obtained?
Sale off
Product cost 95 euros before sale off. After sale off cost 74 euros and 10 cents. About what percentage of produt became cheaper?
Bike cost
The father gave his son € 100 to buy a bicycle, which was 40% of the total amount of the bicycle. How much did the bike cost?