Question

If Rs 800 amounts to Rs 920 in 3 years, what will Rs 900 amounts to in 4 years at the same

rate percent per annum.​

Answer 1

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Given: Principal=Rs.800,Amount=Rs.920,T=3years

Simple interest =920−800=120

∴ Rate % =800×3120×100=5%

If rate % is increased by 5%, i.e., if rate % = 10%, then

SI=100800×3×10=240

∴Amount=Rs.800+Rs.240

=Rs.1,040

HOPE SO IT WILL HELP.......

Answer 2

$S.I = Rs. (920 – 800) = Rs. 120; P = Rs. 800, T = 3 yrs$

 

$R = ( 100 \times 120 ) /800 X 3 = 5%$

$New rate = (5 + 3) \: percent \: = 8 \: percent$

$New S.I. = Rs. (800 X 8 X 3)/ 100= \: Rs. 192$

$New amount = Rs. (800 + 192) = Rs. 992$