Question

Mona's bank charges a $10 fee per month plus a $0.12 fee per check. The formula below gives f, the total fee in dollars for a month in which Mona writes n checks.

f=10+0.12n
How many checks did Mona write during a month in which her total fee was $12.52?

Answer 1

Answer: Mona wrote 21 checks during a month where her total fee was $12.52

Explanation:

f = 10 + 0.12n

12.52 = 10 + 0.12n

`(2.52)/(0.12)` =
`(0.12n)/(0.12)`

n = 21

Mona wrote 21 checks during a month where her total fee was $12.52