In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
D'Asie pencils at the start of the year = 350
Pencils given throughout the year = 50% = 0.5
Step 02:
Pencils give away:
350 - 350 * 0.5 = 350 - 175 = 175
The answer is:
D'Asie gave away 175 pencils throughout the year.