一些孩子为一次募捐活动售卖卡片。每张小卡片售价 50c，每张大卡片售价 $1。下表显示了其中三个孩子售出的卡片数量。

1. Calculate the amount collected by Janice.

Janice: $12 \times \char36{}0.50 + 5 \times \char36{}1 = \char36{}6 + \char36{}5 = \char36{}11$

2. Calculate the amount collected by Doreen.

Doreen: $7 \times \char36{}0.50 + 8 \times \char36{}1 = \char36{}3.50 + \char36{}8 = \char36{}11.50$

3. Calculate the amount collected by Zi Ying.

Zi Ying: $2 \times \char36{}0.50 + 10 \times \char36{}1 = \char36{}1 + \char36{}10 = \char36{}11$

4. Compare the amounts to find the highest.

Comparing $\char36{}11$, $\char36{}11.50$, and $\char36{}11$, Doreen collected the most money, which is $\char36{}11.50$.