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Loan = 3250
3250 = n/2 [2 x 20 + (n-1)15]
3250 = n/2[40 + 15n - 15]
6500 = n [25 + 15n]
15n² + 25n - 6500 = 0
3n² + 5n - 1300 = 0
3n² + 65n - 60n - 1300
n(3n + 65n) - 20(3n + 65)
(n-20)(3n+65)
n = 20 or -65/3
it should be 20 because -ve numbers will not come in months
20months
karthikk35762:
No, The loan he is paying increases by rs15 every month. i.e first month 20 next 35 next 50....
oh like that
I hope it is what you needed
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