Which of the following investments will earn the greatest amount of interest? a. $2,400 invested for 3 years at 5.0% interest b. $1,950 invested for 4 years at 4.0% interest c. $1,600 invested for 8 years at 3.0% interest d. $1,740 invested for 2 years at 8.0% interest

C is the answer. This investment will earn the greatest amount of interest.

Find the interest of all options. Use this following formula.
i = percent of interest × investment × number of years

Option A
i = 5% × 2,400 × 3
i = 0.05 × 2,400 × 3
i = 360
The interest is $360

Option B
i = 4% × 1,950 × 4
i = 0.04 × 1,950 × 4
i = 312
The interest is $312

Option C
i = 3% × 1,600 × 8
i = 0.03 × 1,600 × 8
i = 384
The interest is $384

Option D
i = 8% × 1,740 × 2
i = 0.08 × 1,740 × 2
i = 278.4
The interest is $278.4

Among these numbers: 360, 312, 384, 278.4, the greatest one is 384, therefore the greatest interest is option c