Answer:
(D) A mountain bike
Explanation:
Principal amount = $2000
Interest rate = 4%
Time (t) = 7 years
So, interest after 7 years (I) =

=

= $560
Total amount = 2000+560
= $2560
So, he can afford anything whose price is under $2560.
Most expensive item she could afford to buy is a mountain bike priced at $2500.