On January 1, 1990, Emilio deposited $1650 into a savings account paying
6.2% interest, compounded monthly. If he hasn't made any additional
deposits or withdrawals since then, and if the interest rate has stayed the
same, in what year did his balance hit $3300, according to the rule of 72?
OA. 2001
B. 2003
OC. 2000
D. 2002

Respuesta :

The time required to get a total amount of $3,300.00 with compounded interest on a principal of $1,650.00 at an interest rate of 6.2% per year and compounded 12 times per year is 11.209 years. hence the answer is

A. 2001

Compound Interest Calculation

(about 11 years 3 months)

First, convert R as a percent to r as a decimal

r = R/100

r = 6.2/100

r = 0.062 per year,

Then, solve the equation for t

t = ln(A/P) / n[ln(1 + r/n)]

t = ln(3,300.00/1,650.00) / ( 12 × [ln(1 + 0.062/12)] )

t = ln(3,300.00/1,650.00) / ( 12 × [ln(1 + 0.0051666666666667)] )

t = 11.209 years

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