Poonam required ₹1200 after 12 weeks to send her daughter to school. She saved ₹50 in the first week and increased her weekly saving by ₹10 every week. Find whether she will be able to send her daughter to school after 12 weeks.
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Step-by-step explanation:
As given his savings are 100+120+140+....+320 is an AP
So
a1=100 , d=a2-a1=120-100=20 , n=12
Sum of series will be
Sn=n/2[2a1+(n-1)d]
Sn=12/2[2*100+(12-1)20]
Sn=6[200+220]
Sn=6[420]=2520 rupees it means yes she will be able to collect Rs. 2500.
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