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Artificial rain making/ Cloud seeding.
By selling 36 m of jute, a shopkeeper gains an amount equal to the selling price of 12 m of jute. Find the gain percentage.
A student multiplied a number by 2/5 instead of 5/2 . What is the percentage error in the calculation?
If X = 75% of Y and Y = 125% of Z, then find the ratio of X to that of Z.
Deksha borrowed Rs. 500 at 5% per annum simple interest. What amount (in rupees) will she pay to clear her debt after 4 years?