A businessman lends rs.1800 in two parts, one at 10% and the other at 12% interest. at the end of the year, the average interest rate worked out to be 10.5%. find the interest earned by the businessman from the part which was lent at 10%.
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10x/100+(1800-x)12/100=1800*10.5/100
x=1350
x=1350
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