Answer:
12j = 75.6
Explanation:
This is described as word problem 
Product in mathematics means times and the sign is 'X'
Product of 12 and j means 
12 X j. 
12 is a constant value and j is an unknown variable. 
12 X j = 12j
Given, 12j = 75.6
12j = 75.6 is the equation described in the sentence