Final answer:
The calculation shows that Greg had 20% of the coins both before and after trading, which equals 450 coins in both instances. Therefore, Greg does not have more coins after trading than he had before, and none of the provided options are correct.
Step-by-step explanation:
Let's solve the problem of how many more coins Greg has at the end of trading compared to before. Since we know the total number of coins is 2,250 and we have the percentages that Cristina, Lisa, and Jon have after trading, we can calculate Greg's share both before and after trading.
After trading: Cristina has 32%, Lisa has 22%, and Jon has 26%. So, together they have 32% + 22% + 26% = 80% of the coins, meaning Greg has the remaining 20%.
To calculate the actual number of coins for each percentage, you multiply the total number of coins by the percentage (as a decimal). For Greg, this is 2,250 * 0.20 = 450 coins after trading.
The question does not give us Greg's percentage before trading, but we can figure it out because we know the total coins (2,250) and that Cristina, Lisa, and Jon's percentages add up to less than 100% after trading. Since Greg is the only other collector, the remaining percentage must have been his before trading. Therefore, before trading, Greg had 100% - 80% = 20% of the coins.
This means Greg's number of coins did not change because he had 20% both before and after trading (which equals 450 coins in both cases), and thus he does not have more coins than he had before.
So, none of the options provided (115, 120, 135, 140, 145) are correct as there is no increase in the number of coins that Greg has after the trading.