Answer & Explanation
A) 11.11% decrease
If earlier he is getting Rs. 1 per hr and working for 1 hr, income = Rs. 1
Now he is getting Rs 1.3333 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 dereased by 33.33%, then 11.11 % decrease in income.