Compound Interest

The interest we earn each year is added to principal
Principal goes on changing

CI = Amount - Principal

Questions
1.Find the compound interest on ₹2,000 for 2 years at 15% per annum compounded annually.
(Civil Police Officer 2018)

A=P(1 + R/100)N

2000(1 + 15/100)2

2000(115/100)²

2645

CI=A -P=2645-2000=645

2017
1. ഹരിയും അനസും ഒരേ തുക 2 വർഷത്തേക്ക് ബാങ്കിൽ നിക്ഷേപിച്ചു. ഹരി 10% സാധാരണ പലിശയ്ക്കും, അനസ് 10% കൂട്ടുപലിശയ്ക്കും. കാലാവധി പൂർത്തിയായപ്പോൾ അനസിന് 100 രൂപ കൂടുതൽ കിട്ടിയെങ്കിൽ എത്ര രൂപ വീതമാണ് നിക്ഷേപിച്ചത് ?
(LDC 2017)
R= 10%, N = 2 ,
A for Anas (CI)= A for Hari(SI) + 100
P(1 + R/100)N= P(1+NR/100) +100
P(1+0.1)2= P(1+0.2)+100
P= Rs 10,000

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