To find out how much Ron spends in total, let's break down the calculation:

1. Cost of 3 shirts:
   Each shirt costs $19.90.
   Total cost for 3 shirts = $3 \times 19.90 = 59.70$ dollars.

2. Cost of the jeans:
   The jeans cost $25.50.

3. Total cost before discount:
   Total cost = Cost of 3 shirts + Cost of jeans
   Total cost = $59.70 + 25.50 = 85.20$ dollars.

4. Applying the discount:
   The discount is $8.02.
   Total cost after discount = $85.20 - 8.02 = 77.18$ dollars.

So, Ron spends $77.18 in total.

Would you like more details or have any questions? Here are some related questions you might find interesting:

1. How would the total cost change if the discount was 10% instead of a fixed amount?
2. What would Ron spend if he bought 4 shirts instead of 3?
3. If Ron had a coupon for an additional 5% off after the $8.02 discount, what would his final cost be?
4. How much would Ron have saved if there was no discount?
5. What is the average cost per item after applying the discount?

Tip: When dealing with discounts, always subtract the discount from the total cost before determining the final amount to be paid.