Answer:Here are the answers:1. 25% of 12 = 0.25 x 12 = 32. 100% of 50 = 1 x 50 = 503. 5% of 20 = 0.05 x 20 = 14. 75% of 100 = 0.75 x 100 = 755. 40% of 90 = 0.4 x 90 = 36Step-by-step explanation::) Percentage = base × rate Base = percentage ÷ rate Rate = percentage ÷ base