Answer:
To facilitate quick payment for minor purchases, a PETTY CASH FUND should be set up and maintained using RECEIPTS.
Step-by-step explanation:
There is a mistake on the question, the actual cash is assigned to the petty cash fund, but the system that controls the petty cash fund is called the imprest system. The term imprest system is a very old term that refers to recording and replenishing the petty cash fund.
Initially a certain amount of money is set up as a petty cash fund and recorded under the petty cash account. Then as small expenses are paid using that money, they have to be recorded in receipts (or vouchers if you are British). Then as the petty fund is used up, the receipts are added and recorded, and then the fund is replenished.