起初，谢丽尔拥有的 50\cent 硬币比 $1 硬币多 3 枚。她用 3 枚硬币付了$2.50 买了一支钢笔。 根据所给信息，判断以下每种陈述是“正确”、“错误”还是“无法确定”。请打勾（\u2713）来表示你的答案。

1. Determine the combination of 3 coins used to pay $2.50

To make $\char36{}2.50$ using exactly 3 coins (which can only be $\char36{}1$ or $50\cent$ coins):
$2 \times \char36{}1 + 1 \times 50\cent = \char36{}2.50$
So Cheryl used two $\char36{}1$ coins and one $50\cent$ coin.

2. Calculate the new difference between the number of 50¢ coins and $1 coins

Let the initial number of $\char36{}1$ coins be $x$.
Initial number of $50\cent$ coins = $x + 3$.
After paying, she has $(x - 2)$ $\char36{}1$ coins and $(x + 3 - 1) = (x + 2)$ $50\cent$ coins.
Difference = $(x + 2) - (x - 2) = 4$.
Thus, she has four more $50\cent$ coins than $\char36{}1$ coins.