Answer:
25%
Step-by-step explanation:
Let the original cost price (CP) be x.
Selling price (SP) for Shyam (Shyam buying) =x(p100+1) where p is the profit percentage.
Selling price for Mohan =x(p100+1)(p100+1)
Selling price for Rakesh =x=(1−0.36)×x(p100+1)(p100+1)
⟹(p+100)2=100000.64
⟹p+100=1000.8=125
⟹p=25%