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His total interest after three years is $1,135. 30.
Interest refers to money that is received in an investment or a loan. It is always a percentage of the principal sum.
For the first investment;
I = PRT/100 = $3,000 × 2.7 × 3/100 = $243
For the second investment;
A = P(1 + r/n)^nt
A = 5000(1 + 0.018)^3
A = $5275
I = $5275 - $5000 = $275
For the third investment
A = 5,000(1 + 0.00975)^(4 × 3)
A = $5617
I = $5617 - $5,000 = $617
Total interest = $617 + $275 + $243 = $1,135. 30
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