99 * 0.55 * 2 약식

99 * 0.55 * 2 약식

99 * 0.55 * 2
= 99 * 1.1
= (100 - 1) * 1.1
= 100 * 1.1 - 1 * 1.1
= 110 - 11
= 108.9