Question

Ramya saves two coins of Rs 2 on first day of the week, 4 coins on the second day of the week, 6 coins on the third day of the week and so on. How much money will she save at the end of the week?

Answer 1

Answer:

Rs 24.5

Explanation:

its an arithemetic progresseion where

a=rs2 d=rs4-rs2=rs2 and n=7 as there are 7 days in a week

hence as Sn= n/2(2a+(n-1)d)

                   =7/2(4+(7-1)2)

                   =7/2(7)=49/2=24.5

hence by the end of the week he collects a sum total of rs 24.5