-12 and 3 add up to -9 but multiply to 36.
Answer: 20% increase
Step-by-step explanation: It’s out of 100 and you first got 80 and then you got 100. Since it’s out of 100 you could just subtract to numbers ex: 100-80=20. The answer is 20% increase
a is 321. b is 52 . GOOD luck !!!!!!!!!!!!!!!!!