tolong bantu caranya bagaimana

12/10 + 75/1000 - 3/2 = (1200+75-1500)/1000 = -225/1000 = -9/40

1,2 = 1,200 》7,5% = 7,5/100 = 0,075
1*1per2 = (2×1+1)/2 = 3/2 = 1,500

Jadi, 1,2 + 7,5% - 1*1 per 2 = 1,200+0,075-1,500 = 1,275-1,500 = -0,225 atau -225/1000

-1,500
1,275
_____ _
-0,225