909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090

Write

as a decimal as a fraction as a percent

Solve

What is 909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909 as a fraction?

To write 909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909 as a fraction you have to write 909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909 as numerator and put 1 as the denominator. Now you multiply numerator and denominator by 10 as long as you get in numerator the whole number.
909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909 = 909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909/1 = INF/10

And finally we have:
909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909090909909090909090909090909090909090909090909090909090909090909090909090909090909090909090909099090909090909090909090909090909090909090909090909090909090909090909090909090909090909090990909090909090909090909090909090909090909090909090909090909090909090909090909090909090909 as a fraction equals INF/10