It has an arrow pointing to the left and then a dot and a zero beside it and under them it has a dot and two zeros. This indicates that in has gone from having one decimal point to having two decimal points.
.
a Decimal.
It is already a decimal in the form of 78.5
A decimal looks like this 0.16 however it can be any number at the end.
There are decimal points in decimal numbers. They look just like periods.
1.5% = 0.015 in decimal
Yes, it does.
It's the 'paste' button.
A hole
0.000000001
0.33
2 or 2.0