In some year, a candy shop produced 100 boxes of candy per working day in January. In each month following this, the shop produced 25 more boxes of candy per working day in addition to the previous

In some year, a candy shop produced 100 boxes of candy per working day in January. In each month following this, the shop produced 25 more boxes of candy per working day in addition to the previous month.

a) How many boxes did the candy shop produce on each working day in October?

b)How many boxes did the candy shop produce in that year, assuming that each month has 20 working days?