Hourly wage = $7.50 + (0.25 x 6m)
Ahmed starts off at $7.50 an hour. You would add $0.25 an hour every 6 months. m = the number of times 6 months has passed. So the 1st 6 months m=1, the 2nd 6 months m=2, etc. For the time between Ahmed's start date and his 1st 6 months, m=0.
