18,000 for 2½ years at 10% per annum compounded annually , calculate the amound and compound interest ....
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a=18000(1+10/100)²×(1+1/2×10/100)
a=18000×11/10×11×10×21/20
a=9×11×11×21
a=99×231
a=22869
ci=a-p
ci=22869-18000
CI=4869
hope it helped
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