The difference of simple intrest of rs 1200 for 3 years and that rs 800 for 4 yrs at same rate is 20 rs the rate % per annum is
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first time
p=1200
r=20
t=3years
S. I. = PRT/100
=1200*20*3/100
=12*20*3
=720
amount =principal +interest
=1200+720
=1920
second time
p=800
r=20
t,=4years
S. I=PRT/100
=800*20*4/100
=8*20*4
=640
amount =principal +interest
=800+640
=1440
S. I=1920-1440
=480
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