The first step to solve this problem is to compute for the
total minutes allowable in his cell phone plan. To compute for this, you have
to divide the number of minutes consumed by the fraction of the time consumed.
200 minutes / 33 1/3% = 600 minutes
To compute for the remaining minutes left for this month,
you have to deduct the consumed minutes to the total allowable minutes in his
plan.
600 minutes – 200 minutes = 400 minutes left
