Question

A boy spends Rs 10 on first day, Rs 20 on the second day, Rs. 40 on the third day and so on. find how much, in all will he spend in 12 days ? (GP)
-with steps ​

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

10,20,40,80,............................to 12 terms

r=2   common ratio

a=10  first term

S = a(1 - r^n)/(1 - r)

S = 10(1 - 2^12)/(1 - 2)

S = 10×(-4096)/(-1)

S=40960 rs