nitish borrows a sum of 1200rupees at the beginning of a year. after 4 months 1800rupees more is borrowed at a rate of interest double the previous one. at the end of the year the sum of interest on both the loans 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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