Question

Answer this please fast, i'm confused.
The local grocery store has videotapes on sale, $3.00 for 2 tapes. You have $20.
a) How many tapes can you buy?
b) If there is a 7% sales tax on the tapes, how many can you buy?
(Explain your answers)

Answer 1

a) 13 and b) 12

Answer 2

How did you get the answer? explain please?

Answer 3

\[\frac{20}{3} = 6\frac{2}{3}\]
We times that by 2 to get the amount of tapes. This assumes you can buy the tapes in odd numbers and not forced to buy in pairs:
\[2(\frac{20}{3})=\frac{40}{3}=13\frac{1}{3}\]
We round down to 13.
We times $3.00 by 1.07 to get the cost with sales. Then we repeat the process:
\[3.00*1.07=3.21\]
\[\frac{20}{3.21} \approx 6.23\]
We again times by 2:
\[2(6.23) = 12.46 \approx 12\]