Kabir puts ₹5 in his piggy bank in the first week, ₹8 in the second week, ₹11 in the third week, and keeps adding ₹3 more each week. How much has he saved in all after 16 weeks? (answer in ₹)
Competition practiceAlgebra
A440
B420
C460
D400
Step-by-Step Solution
The weekly amounts form an AP with a=5,d=3,n=16.S=(16/2)[2×5+15×3]=8×55=440.
Answer: A) 440
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