Nitesh borrowed a sum of 1200 Rupees at the beginning of the year .After 4 months 1800 more is borrowed at a rate of interest double the previous one at the end of year the sum of interest on the both loan is 216 what is the first rate of interest per annum.
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(1200*x/100)+((1800*2x/100)*(8/12)=216
12x+24x=216
36x=216
x=216/36
x=6
12x+24x=216
36x=216
x=216/36
x=6
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