Determine the rate per cent per annum if Rs 6,250 amounts to Rs 6760 in six months ,interest being compounded quarterly

Using formula, İ=PRT where P=6520

İ=6750—6250=510, T= 1/2, find R
Putting values.
510=6250×R×1/2
R=1020×2/6250=0.16
R=0.16×100%
R=16%

Thanks

Oops. r=16%

I calculated with r as the 6-month interest rate.

Please send steps

Steve please

6250(1+r/2)^2 = 6760

r = 8%

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