Question

If Rs 4,000 amounts to Rs. 5,200 at simple interest in 3 years, the rate of interest is ____% p.a.​

Answer 1

p = 4000

a = 5200

so, (prt/100) + p = a

(4000*r*3/100) + 4000 = 5200

120r + 4000 = 5200

120r = 1200

r = 1200/120

r = 10per

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