Identify the segment with grammatical error:
I never remember to have seen a more exciting movie.
Identify the segment with error:
After returning from the post office I laid down on the coach to rest.
Identify the segment with error:
Besides the river he lay to take rest for some time.

A sum of Rs. 800 amounts to Rs. 920 in 3 years at simple interest. What would be the amount, if the interest rate is increased by 3%?
In what ratio must water be mixed with milk to gain 20% by selling the mixture at cost price?