Consider the case of a bank offering r (given as a decimal) interest per year compounded monthly, if you deposit $p.
a. what is the interest rate per month?
b. write a formula for the amount a you have after nn months.
c. write a formula for the number of months it takes to have a dollars.
d. what is the doubling-time of an investment earning 7% interest per year, compounded monthly? round up to
the next month.

answer: #1 ads up by 8 and i don't know #2

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true