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Let C invests Rs.x Therefore, B invests = Rs(x-10% of x) =Rs.(x-x/10) =Rs. 9x/10 A is said to invest 10% more than B. Therefore, A invests=Rs.(9x/10+10%of 9x/10) =Rs . 9x/10+9x/100 =Rs. 99x/100 Given ,sum of their investments=Rs.5780 Therefore,By the condition 99x/100+9x/10+x=5780 or, 99x+90x+100x=5780*100 (After multiplying by 100,the LCM of the denominators) or,289x=5780*100 or, x=(5780*100)/289 or, x=20*100 or,x=Rs.2000 Therefore, C invested Rs.x=Rs.2000 Ans)C invested Rs.2000.