Question

Rahuľ father wants to deposit some amount of money every year on the day of rahul'sbirthday .on his 1st birthday rd.100,on his 2nd birthday rs.300 , on his 3rd birthday rs.600 on his 4th birthday RSS.1000 and so on .what is the amount deposited by his father on radio's 15th birthday give the solution

Answer 1

Rahul father gave the 15th birthday
$300 + 100 + 600 + 1000 = 2500$

Answer 2

I knew the answer but not process answer is 12000 not 2500