Allan saved 20 on Monday, 21 on Tuesday, 22 on Wednesday, and so on. How much would be his total saving in 30 days? *
Answers
Answered by
0
Answer:
he saved $316 is the answer
Answered by
1
Answer:
1035
Step-by-step explanation:
This can be understood as an AP, where first term is a = 20 and common difference is d = 21 - 20 = 1.
In 30 days, means, 30th term of the AP.
Sum of n term = (n/2) (2a + (n - 1)d)
⇒ (30/2)[ 2(20) + (30 - 1)(1) ]
⇒ 15[40 + 29]
⇒ 15 * 69
⇒ 1035
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