Question

Last month, the daily balance in Joana's credit card account was $1,000 for 9 days, $750 for 10 days, $850 for 4 days, and $900

Complete the expression to find Joana's average daily balance.

750

1.000

900

30

850

90

) + 100

) +40

) + 70

C

Reset

Next

nts reserved.

Answer 1

9(1000) + 10(750) + 4(850) + 7(900)

30

Step-by-step explanation: I got it right

Answer 2

`Average = \$873`

Explanation:

Given

$1000 for 9 days

$750 for 10 days

$850 for 4 days

$900 for other days

Required

Compute the daily average

First, we need to compute the number of days her balance is $900

Assuming the billing cycle is 30 days;

`Number\ of\ days = 30 - (9 + 10 + 4)`

`Number\ of\ days = 30 - 23`

`Number\ of\ days = 7`

The Average is then calculates using:

`Average = (\sum fx)/(x)`

`Average = (1000 * 9 + 750 * 10 + 850 * 4 + 900 * 7)/(9 + 10 + 4+ 7)`

`Average = (26200)/(30)`

`Average = 873.333333333`

`Average = \$873` --- Approximated