if the amount is 7500 rupees and principal is 5400 rupees then its compound interest is _________
a) 2100 rupees b) 1100 rupees c) 1000 rupees d) 2000 rupees
std 7
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2100
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Step-by-step explanation:
1st year
Principal, P=Rs.5000
Time, T=1 year
Rate of interest ,R=6%
∴simple Interest, SI=100PTR=1005000×10×6=Rs.300
∴Amount=P+SI=Rs.5300
2nd year
Principal = Amount of 1st year=Rs.5300
Rate of interest =8%
Time =1 year
∴ Interest =1005300×1×8=Rs.424
∴ Amount =Rs.(5300+424)=Rs.5724
The interest of 2nd year is the required compound interest. So, C.I=rs.424 and the required amount is Rs.5724
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