A person deposited rs. 400 for 2 years, rs. 550 for 4 years and rs. 1,200 for 6 years at same rate of interest per annum. He received the total simple interest of rs. 1,020. The rate of interest per annum is
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Case 1)S.I.=400*2*r/100=8r
Case 2)S.I.=550*4*r/100=33r
Case3)S.I.=1200*6*r/100=72r
Total S.I. =8r+33r+72r=113r
therefore 33r=1020
r=1020/331=340/11
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