Are these ratios equivalent? 19,000 staff members to 2,000 campers 63,000 staff members to 5,000 campers

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Need asap. solve for the following inequality

Is the number 128.439 a rational number