On each birthday , john received from his father rs 5 for each year of his age . find the total sum john had received by the time he was 21 years old.
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Here is your answer
5rupees each year * 21 years
= 5*21
= 105
Answer
John recieved ₹105 by the time he was 21 yrs old
5rupees each year * 21 years
= 5*21
= 105
Answer
John recieved ₹105 by the time he was 21 yrs old
Answered by
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Sn= ? , a= 5, d= 5 , n = 21
Sn = n÷2 [2a +(n -1 )(d)]
Sn = 21÷2[2(5)+21- 1 (5)]
Sn =21÷ 2[(10)+20(5)]
Sn = 21÷2( 10+ 100 )
Sn = 21÷2(110)
Sn =21 × 55
Sn = 1,155
Therefore John recieved a total sum of Rs 1,155 by the time he was 21 years old.
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