Interest amount = Principal x rate x time in years
Annual interest earned by Harold = $ 150 x 14 % x 1 = $ 150 x 0.14 = $ 21
Accumulated interest at the end of 20 years can be computed using formula for FV of annuity as:
FV = Annual cash investment x FVIFA (11 %, 20)
= $ 21 x [{(1+0.11)20 – 1}/0.11]
= $ 21 x [{(1.11)20 – 1}/0.11]
= $ 21 x [{(8.06231153612915 – 1}/0.11]
= $ 21 x [(7.06231153612915)/0.11]
= $ 21 x 64.2028321466287
= $ 1,348.2594750792 or $ 1,348.26
Accumulated interest of Harold at the end of 20 years is $ 1,348.26
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