Can someone explain to me how the result is 100 of this assignment Operator?

Question

Please calculate and type the resulting value of the following expression:
var result = 20;
result *= 5;

Answer 1

it's same as:
result = result *5

result = 20*5
result = 100

Answer 2

result*=5;
Is same as
result = result * 5;
same 20*5 = 100;