Question

In a certain country the electricity charges are: Fixed charge $5. First 100 units: 11c per unit. More than 100 units: 7c per unit. How much do 320 units cost?
a. $26.40 b. $ 31.40 c. $57.60 d. $62.60

Answer 1

Answer:

b. $ 31.4

Step-by-step explanation:

First 100 units- 11c X100 = 1100 c = $ 11

Nest 220 units (320-100) = 7c X 220 = 1540 c = $ 15.4

Fixed Charges = $5

Therefore Total electricity charges is 11+15.4+5 = $ 31.4