This caption needs to be 20 words long, but my picture explains everything lol... i hope this helps :)
Answer:
$16.92
Step-by-step explanation:
Just divide 42.30 by 2.5 and it will give you the answer
Answer:
Multiplication
Step-by-step explanation:
I think what you're talking about is not a decimal, but a multiplication point:

This dot can donate multiplication when in the middle of two numbers and/or fractions.
But if you're talking about some other point, then I don't know, sorry. :(
*You could use a calculator
50 times 50 times 50 times 20 equals <span>2500000</span>
Your answer is <em>2500000</em>