Answer:
1250,Rs
Explanation:
Let Reetu paid for the watch x Rs. Then Reetu sold the watch to Reshmi having 20% profit => the selling price is 1.2*x
Then Teshmi sold the wathes with 10% loss (or 0.9 from purchase price 1.2x) to Nikita, i.e. selling price is
1.2*x*0.9=1350
1.08*x=1350
x=1350:1.08
x=1250, Rs