Answer:
19860
Explanation:
According to the formula for base after percentage decrease12, we have: Decreased value = base - base * % decrease / 100
Rearranging the formula to solve for base, we get:
base = Decreased value / (1 - % decrease / 100)
Plugging in the given values, we get:
base = 13902 / (1 - 30 / 100)
base = 13902 / 0.7
base = 19860
Therefore, the base is 19860. I hope this helps.