1 to 4
150mm is the same as 15cm
15cm:60cm
both divisible by 15
1cm:4cm
1 to 4
The first option because turn them all into degrees and it says:
54, 60, 90, 120, 255

Hope you could get an idea from here.
Doubt clarification - use comment section.
To start break even they need to sell 100 but if they want to make profit they need to sell 101 because you can use the equation y = .75x - 55