Mohan lends 4800 rupees to John for 4 1/2 years and 2500 rupees for 6 years and recieves a total sum of 2196 rupees as interest. Find the rate per cent annum, it being the same in both the cases.
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4800*9/2x+2500*6x=2196
2400*9x+15000x=2196
21600x+15000x=2196
36600x=2196
x=6/100
6percent per anum
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