What will be profit percentage if selling cost of a house is 20,00,000 and cost price is 13,00,000?

You need to work on presentation. Commas are placed in numbers every three digits counting from the decimal, and not any other pattern. Profit depends on more than just the difference between purchase price and sale price.

Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.

Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.

Percent is simply a ruler with 100 marks. The only confusion is trying to keep track of what the marks represent, since that changes from time to time. To calculate profit as a percent you must specify percent of what. Given 10 and 13, the difference is 7 so that is one sort of profit. When expressed as a percent of sale price, profit is 7/20 x 100% = 35%. When expressed as a percent of purchase price, profit is 7/13 x 100% = 53.85%. There are some other calculations usually involved, so you need to be careful to say what you are talking about.