her total savings in 1 year =rs 70455
Answer:
first term a=rs 10
second term b =11
common difference d=11-10=1
n=366days because 2016 is leap year
now
Sn=n/2[2a+(n-1)d]
S365 =366/2[2×10+(366-1)1]
=366/2[20+365]
=rs70455