Take your age:
Double it:
Add 5:
Multiply by 50:
Subtract 365:
Add the loose change in your pocket:
Add 115:
The first two digits in your answer are your age,
and the last two digits are the change in your pocket.
Let a = age and c = change in your pocket.
Then following the instructions above:
Your age: a
Double it: 2a
Add 5: 2a + 5
Multiply by 50: 100a + 250
Subtract 365: 100a - 115
Add the loose change in your pocket: 100a - 115 + c
Add 115 to get: 100a + c. (The 100 just moves the month over 2 places)