To find out how much you paid for the pair of pants, we can subtract the price of the T-shirt from the total amount paid.

Given:

• Total amount paid = $121.1
• Price of the T-shirt = $37.7

The price of the pants is:

$\text{Price of pants} = \text{Total amount} - \text{Price of T-shirt} = 121.1 - 37.7 = 83.4$

So, you paid $83.4 for the pair of pants.

Would you like more details or have any questions about this? Here are five related questions you could explore:

1. What if the total amount was different, say $150.5, but the T-shirt price remained the same?
2. How much would you pay for two pairs of pants at the same price?
3. If there was a 10% discount on the pants, how much would you save?
4. What percentage of the total amount was spent on the T-shirt?
5. How would the calculation change if you had a discount on both items?

Tip: When subtracting, always double-check that both numbers are aligned by their decimal points to avoid mistakes!