Mrs rane gives 0.025 part of her salary as pocket money to her son vinod every month .vinod spends 0.8 part of his pocket money and saves the rest .if he saves rupees 277.50in three months how much does mrs range earn in a month.

The number 18 is a 120% of the number 15. That is because when you divide the two numbers you get 1.2. Then you multiply this number by a hundred to see what the percentage number is and you get 120 which means that 18 is a 120% of the number 15. Similarly, if you had for example 7, you would divide 7 by 15 and multiply and see that it's just under 50%. This is the basic formula for calculating percentage.

A. is the answer in this question