The price of an air conditioner was reduced from rs 27000 to rs 24000 find the rate of percentage

The rate of percentage is basically finding out the new price as a proportion of the old price. Hence the answer is 24000/27000 x 100, multiplying with 100 to obtain the percentage.

However, if you're finding the percentage reduced, you will be taking the price it is reduced by over the original price and finding the percentage which would hence be 3000/27000x100.