Prakhar invests 9000 rupees and Sahil invests 11000 rupees for 3 and half years at the same rate of interest ? Find the rate of interest , if Sahil gets 140 rupees more interest than Prakhar .
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In △ABC
AB, BC and AC touches the circle at the point P, Q and R respectively.
∴ BC+AP=AC+PB
⟹ 13+7=AC+PB
⟹ AC=20−PB
Perimeter of △ABC=AB+BC+AC
=AP+PB+13+20−PB
=7+13+20=40
∴ Perimeter of △ABC is 40 cm.
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