Tolong di jawab secepat nya pake cara

1 a.20/100 x 2500 = 500
   b.80/100 x 2500 = 2000
2 a.1/4 x 600 = 150
   b.3/8 x 600 = 225
   c.1/4 x 2 =2/8 + 3/8= 5/8
      berarti kopi 3/8
      3/8 x 600 = 225

sekian, jawaban terbaik tolong ^_^