Steph scored $10$ baskets out of $10$ attempts in the first half of a game, and $15$ baskets out of $20$ attempts in the second half. Candace took $18$ attempts in the first half and $12$ attempts in the second. In each half, Steph scored a higher percentage of baskets than Candace. Surprisingly, they ended with the same overall percentage of baskets scored. How many more baskets did Candace score in the first half than in the second?