Let me solve it by retell a similar story where all money are 10 times bigger except the pocketed.
Three men went into a pub. They bought food and drink to equal 300 shillings. They paid 100 shillings each to the waiter, who took the money to the cashier. The cashier said the men had been over charged, and gave the waiter back 50 shillings. The rascally waiter pocketed 2 shillings, then gave the men back 48. The men were happy. Instead of paying 100 shillings each, they paid 84.
3 men at 84 shillings each comes to 252 shillings. The waiter pocketed 2 shillings, that takes the total to 254. But they paid 300. Where are the 46 shillings?