Final answer:
To find the credit use percentage with card A having a zero balance, subtract the credit use percentage of card A from the overall credit use percentage. The credit use percentage of card A can be found using a proportion. The credit use percentage with card A having a zero balance is 7.25% rounded to the nearest hundredth.
Step-by-step explanation:
To calculate the credit use percentage with card A having a zero balance, we need to subtract the percentage of credit used by card A from the overall credit use percentage.
First, we need to determine the credit use percentage of card A. If card A is 80% of the overall credit use, then 80% of the overall credit use is equal to 36.25%.
To find the credit use percentage of card A, we can set up a proportion:
80/100 = x/36.25
where x represents the credit use percentage of card A. Solving for x, we get:
x = (80 * 36.25) / 100 = 29
Therefore, the credit use percentage of card A is 29%.
To find the credit use percentage with card A having a zero balance, we subtract 29% from the overall credit use percentage:
Overall credit use percentage - Credit use percentage of card A = Credit use percentage with card A having a zero balance
36.25% - 29% = 7.25%
So, the credit use percentage with card A having a zero balance would be 7.25% rounded to the nearest hundredth.