Answer:
approximately 33.55%
Explanation:
To calculate the percentage of money spent, you can use the following formula:
Percentage spent = (Amount spent / Total amount) * 100
In this case, the amount spent is $13.42 and the total amount she started with is $40. Let's plug these values into the formula:
Percentage spent = ($13.42 / $40) * 100
= 0.3355 * 100
= 33.55%
So, she spent approximately 33.55% of her money on the two shirts.