Respuesta :

musiclover10045
lets look at the first one:
100 pages 5.00 price ratio is 0.05 the ratio is 5.00 / 100

so a would be 20.00 / 400 = 0.05

b = 6.25 / 125 = 0.05

c = 15.00 / 350 = 0.04