To find out how many dollars in singles Elaine has, we can start by finding out how many single dollar bills Tom has.
Given that Tom has 1/5 more single dollar bills than Monica, and Monica has $10 in singles, we can calculate Tom's number of single dollar bills.
1/5 more than Monica's singles = 1/5 * $10 = $2
So, Tom has $10 + $2 = $12 in singles.
Now, we are given that Tom has 1/5 fewer single dollar bills than Elaine. To find out how many single dollar bills Elaine has, we can calculate the amount by adding the 1/5 of Tom's singles to Tom's singles.
1/5 fewer than Tom's singles = 1/5 * $12 = $2.4
Elaine has $12 + $2.4 = $14.4 in singles.
Therefore, Elaine has $14.4 in singles.