A man repays a loan of rs 1800 by paying rs 40 in the first month and then increases the payment by rs 20 every month. how loan will take him to clear the loan
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tn=a+(n-1)d
1800=40+(n-1)20
1800=40+20n-20
1800=20+20n
1780÷20=69
n=69
1800=40+(n-1)20
1800=40+20n-20
1800=20+20n
1780÷20=69
n=69
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