108 ÷ 36 of 1/3 + 2/5 + 3 3/ 4 =?

Given expression = 108 ÷ 36 of 1/3 + 2/5 + 3³/₄
= 108 / 12 + 2 / 5 x 15 / 4
= 9 + 3 / 2
= 21 / 2
= 10¹/₂