a man receives rs 60 for the first week and rs 3 more each week than the preceding week. how much does he earns by the 20th week 

The earning of man in Rs in the first week, second week, third week and so on is,60, 63, 66, ...........Now, the above list forms an AP with first term, a = 60 and common difference, d = 3Now, earning of man in 20 weeks = S20Sum of first n terms of AP is given by,Sn = n22a+n-1dSo, S20 = 2022×60 + 19×3=10120 + 57=10 × 177=1770So, earnings of man in 20 weeks = Rs 1770

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Please find this answer

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a = 60
d = 3 
a20 = a + 19d
= 60 + 19(3)
= 60 + 57
= Rs. 117 
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