Answer: The equation used to solve each percent problem is x/100 * a, where x is the percentage and a is the Total amount.
Step-by-step explanation: In this question, we have to find out the 25% of 50, so
25/100 * 50 = 1/4*50
=> 1/4*50 = 12.5
and after rounding it to nearest 10th we get 13 as the final answer.