Allen started to save money from his daily allowance. in the first week he saved $5.8 and every next week $3.6 more than the previous week. how much money did he save in 4 weeks?

$44.8.

Step-by-step explanation:

Let a = first term = $5.8

d = common difference = $3.6

n = number of terms = 4

Using the sum of terms

Sn = n/2((2a + (n - 1)d))

Sn = 4/2((2(5.8) + (4 - 1)3.6))

     = 2(11.6 + 10.8)

     = 2(22.4)

     = 44.8

In 4 weeks, Allen would have saved $44.8.

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step-by-step explanation: