Question

600 units of electricity and 100 units of gas were used for a total cost of $388. Next month, 400 units of electricity and 150 units of gas were used for a total cost of $277. Find the cost per unit of gas.

Answer 1

Cost per Electricity Unit= $0.61

Cost per Gas Unit= $0.22

Explanation:

Suppose,

Cost per Electricity Unit: e

Cost per Gas Unit: g

for the first month condition, equation would be

`600*e+100*g=388...........................................(i)`

and for the next month condition, equation would be like

`400*e+150*g=277...........................................(ii)`

By solving both linear equations simultaneously, we get

e=0.61 and g=0.22