Radhika and Niharika borrowed rupees 21000 and rupees 15000 respectively at the same rate of simple interest for 4 years if Radhika paid rupees 1440 more interest than Niharika find the rate of interest per annum
answer it in percent
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Answer:
radhika - 21000
niharika - 15000
T=4years
SI of radhika = 1440 + SI of niharika
21000*4*R/100 = 1440 + 15000*4*R/100
840R = 1440 + 600R
240R = 1440
R = 6%
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