Answer: $16.16
Step-by-step explanation:
This can be done very quickly with a calculator: 20-3.84 = 16.16
But I'll assume you want to use mental math.
The jump from 84 to 90 is +6. Then do another +10 to get to 100. So far we've increased by 16 cents (because 6+10 = 16). This will get us from $3.84 to $4.00
Then we go another $16 upward to arrive at $20; you can think of it like 4+16 = 20 or 20-4 = 16.
Overall, we have an increase of 0.16+16 = 16.16 dollars. This is the change given back to the customer.
To check the answer: 3.84 + 16.16 = 20 or 20-3.84 = 16.16
Here are some ways to make change for $16.16
- One $10 bill, one $5 bill, one $1 bill, one dime, one nickel, one penny.
- One $10 bill, one $5 bill, one $1 bill, three nickels, one penny.
- Three $5 bills, one $1 bill, three nickels, one penny.
- Other combos are possible.