We need to print 19 copies of the year-end status report, that is 136 pages long.
Let's find the total of pages we will print:
136 * 19 = 2,584
Now we know that every ream has 500 pages.
For calculating the number of reams, we divide the total pages we need to print between the number of pages a ream has.
2,584 / 500 = 5.168
The exercise tells us that partial reams are accepted.
Then for calculating the price of the reams we need, we multiply this way:
5.168 * 3.80 = 19.6384
Rounding to the next cent:
$ 19.64