HELP HOW TO ENTER CORRECT AMOUNT CUSTOMER GIVES ON CASHIER WITHOUT DECIMAL POINTS?

I am about to work soon and on the cashier there is just a keypad with 0-9 and then 00. If a customer gives me 5.46 how would I enter the decimal point when there is none. If I enter 546 all together should the decimal point automatically come in? but then how does the machine know I am not entering 54.6 and just... show more I am about to work soon and on the cashier there is just a keypad with 0-9 and then 00. If a customer gives me 5.46 how would I enter the decimal point when there is none. If I enter 546 all together should the decimal point automatically come in? but then how does the machine know I am not entering 54.6 and just 5.46 ?!!
this is giving me anxiety for tomorrow
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