Answer: 12 1/2 years
Step-by-step explanation:
If the salary doubling in currency, it would need a 100% raise. Simply divide 100% by 8% to get the number of years needed.
100 / 8 = 12.5 or 12 1/2
8% of 25,000 = 2,000
25,000 / 2,000 = 12.5 or 12 1/2
The figure suggests that the two sub-triangle are similar, because they are both right and the angle at the top is the same.
If that is the case, we can claim that the correspondent sides are in proportion:
Solving for x we have