4.3 times 21 = 5 times 20 so what do I add after the 20?

Answer:
4.3 * 21 = 90.3 5 * 20 = 100
Step-by-step explanation:
4.3 * 21 = 90.3
5 * 20 = 100
90.3 + 100 = 190.3