The cost of a machine is 10000.The value decreases by 20%  every year,what will the cost of the machine after 2 years.

The cost of a machine is 10000.The value decreases by 20%  every year,what will the cost of the machine after 2 years.

The population of a town at present is 2000.If it increases by 10% every year,what is the population after 2 years?

What is 20% of 5% of 50% of 10000

If the cost of 20 pens is equal to SP of 30pens,find loss%

If CP of 10 pens is equal to SP of 20 pens,find gain%