What is wrong with the following code snippet:

num$1=10$

num $2=20$

num $3=30$

total $=$ Num$1+$ Num$2+$ Num$3$

The numbers should be $10\mathrm{.}0,20\mathrm{.}0$ and $30\mathrm{.}0$

Nothing, the variable total will be the sum of the three numbers

Python is case sensitive so Num$1,$ Num$2,$ and Num$3$ are undefined

total must be initialized to zero first