Answer:
A. 0.25 units
Step-by-step explanation:
Each tick mark in the pressure gauge pictured is worth 0.25 units.
From the beginning of the guage, it reads 0.0 and the next unit is 0.5. Therefore: 0.0 + 0.25 = 0.25 then 0.25+0.25 = 0.5. So you will discover that 0.25 units is added in each tick.
Therefore, 0.25 units is the amount that is added in each tick on the pressure guage.