Mr. Raj purchased new vehicle.
When his friend Mr. Ratan enquired about its number, Mr. Raj replied that it is four digit number with all different digits in ascending order.
The ratio of first two digits and last two digits is equal.
Also fourth digit at unit place is three times the second digits at hundred place.
Mr. Ratan was good at mathematics, so he quickly replied that there are two such a four-digit numbers.
Find the difference of these two numbers.
