Disposition problem

 My father diposit 1000$ in my account on my every birthday....
When 18, I found only 4000$ in my account..

Answer in Comment.

NUMARIC FUN 01

A little numeric FUN.
how will it be if you say me a number between 1 and 9 and I just multiply 2 numbers and then you'll see I'll have arrange that number 9 times.
Suppose You choose the number 4 and I show the result in calculate such.

this will be a bigger fun if I say one of these tho number, I used to multiply is always constant!

this red mark number is always constant. and other two digit number will vary......

let's learn the technique...
take the number that the chooser have choosed and multiply with 9.

 then what will be the constant number I mentioned earlier?

use 12345679

 isn't it sweet?