Answer:
$300
Explanation:
Here we are given:
Balance at the beginning of last cycle(first half) = $400
Balance halfway through the cycle(second half cycle) = $200
To find the amount Aaron's checking account pay interest last cycle, let's find the average balance.
Use the formula for average:
![(600)/(2) = 300](https://img.qammunity.org/2021/formulas/mathematics/high-school/3rn3idxg2zchmtxu6zctsydiav8jkxj03a.png)
Average = $300
Therefore, the amount Aaron's checking account pay interest last cycle is $300