26 and a 1/2
26.6 repeating
34857389145
There are infinitely many possible answers. One such is 1*400
400 times 12.5% equals 50.
400*4 = 1600
15 times 15 equals 225.
44.4444 x 9 = 400
400 x 1.0275 = 411
125% of 320 = 400
15-3 times 2 equals 15-6 equals 9.
400
400
100
16