$300 Mini Wallet Savings Challenge

There are 24 cash slots within this wallet.
There are 12 front-facing slots and 12 rear-facing slots. 

The slots are designated as $5, $10, $15, or $20. If you add money into the front-facing slots only, you will save $150. Adding money to both the front and back-facing slots will save you a total of $300. 

This challenge can be reused once completed.

Wallet Sizes - 10.2cm (length) x 7.5cm (width)