Question

plzzz solve this question properly....
the answer is -43/40
but I can't find my solution if you answer correct I will mark the brain list and follow you ​

Answer 1

(0.144/1.2)/(0.016/0.02)+ 7/5 -21/8

(144/1200)/(16/20) + 7/5 - 21/8

(12/100)/(4/5) + 7/5 - 21/8

(6/50)/(4/5) + 7/5 -21/8

6×5/50×4 + 7/5 - 21/8

3/20 + 7/5 - 21/8

(3×2 + 7×8 - 21×5)/40

( 6 + 56 - 105)/40

-43/40