Price and CVP

Dear Tutor, comment the following questions whether I selected correctly or wrongly?

1)In profit volume table, does dotted line represent fixed cost ?-is it true or false?
2)In order to break even the highest c/s per product will be selected-yes it is true
3)The highest point in the profit volume table represent the lowest c/s -yes it is true

I took 2 and 3 as dotted line i thoughut is false

Another question

Demand 500——-when price is 2

Demand x———–when price 2.20

in the answer I took demand between 450 and 500 and revenue per item
revenue per item-has been showen in all multipple choices

For me it is important there was also “fewer than 450 option and revenue per item” but the rest was “between 500 and 550 and revenue per item” so between 500 and 550 can not be if price increase.

Dear Tutor what do you think about this one? I took between 450 and 500