A man is paid r naira per hour for normal work and double rate for overtime. If he does a 35-hour week which includes q hours of overtime, what is his weekly earning in naira?
Worked solution (try it first)
The 35 hours include the q overtime hours, so the normal hours are 35−q, paid r(35−q).
Overtime is at double rate: q hours at 2r gives 2qr.