Good heavens! That's enough.That's enough.
Use the ABC------,to talk that $79 + $ 18 = $ 97 is right and 100 - 3 = 97 is wrong.
79 is money { $ }, it is from boss to customer, 18 is moeey ( $ ), it is from boss to
for goods cost. 100 and 3 are number , not money ( $ ) and can change any time,
so 100 - 3 = 97 is wrong.
$97 + $3 = $100. What is?