Tank - fuel prices

I have a car with a 50l tank. My task is to find out the price of a full tank of fuel by weighted average at the end of the year. In December, 30l of fuel was filled - 37.50 CZK, and in November 40l - 38.40 CZK. What is the price per 1 liter and the value of a full tank by weighted average?

Correct answer:

c =  38.0143 Kc/l
x =  1900.7143 Kc

Step-by-step explanation:

V=50 l V1=30 l c1=37.50 Kc/l V2=40 l c2=38.40 Kc/l  c=V1+V2V1 c1+V2 c2=30+4030 37.5+40 38.4=38.0143 Kc/l
x=c V=38.0143 50=1900.7143 Kc



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