Answer:
X = 9 or 1/3
Step-by-step explanation:
Explanation given in attachment in order to well articulate the logarithm sign.
Note addition in logarithm means multiplication.
The logarithm of a number the same as the base is 1.
Here the function given by
Now
f(1):-
140 because half which is (%50) of 350 is 175 so 40% of 350 is 140
