If earlier he is getting Rs.1 per hr and working for 1 hr, income = Rs.1
Now he is getting Rs1.3333 per hr and working for 0.66667 hrs Then income for 0.66667 hrs= Rs. 0.8889.
If payment per hr is increased by 33.33 and working hours decreased by 33.33%, then 11.11 decrease in income.