1. Principal: $42000
Interest Rate:4.5%(p.a.)
Simple interest: 6300
Find the period and the amount.
2. interest rate:(p.a.) 4% (compounded half-yearly)
Period; 18 months
Amount;$53060.4
Find the principal and the compound interest.
Ans: 1. 40 months / $48300
2. $50000/$3060.4
I wanna know the steps, thx a lot.
2條F.3 MATHS(PERCENTAGE)拎5点(急
2011-09-25 5:11 am
回答 (1)
2011-09-25 5:59 am
✔ 最佳答案
1.P = $42000
I = 4.5% (per annum)
I = $6300
n = ? years
I = P ´ R% ´ n
6300 = 42000 ´ 4.5% ´ n
n = 10/3
Period
= 10/3 years
= (10/3) ´ 12 months
= 40 months
Amount
= P + I
= $42000 + $6300
= $48300
2.
R% = 4%/2 = 2% (per half year)
n = 18/6 half years = 3 half years
A = $53060.4
P = $?
A = P ´ (1 + R%)^n
$53060.4 = P ´ (1 + 2%)^3
P = $53060.4 / (1.02)^3
Principal, P = $50000
Compound interest, I
= A - P
= $53060.4 - $50000
= $3060.4
參考: 賣女孩的火柴
收錄日期: 2021-04-13 18:15:54
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