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Cost Ratio = expenses/earnings
It is 100*staff costs/total costs.
In schools, for example, it is usually expressed as the number of students per teacher. In any case, ratio means comparing one number to another, so staffing ratio compares number of students to number of staff (teachers).
Total Sales Revenue = 88140 Total Cost = 11300 * (4.29+2.73) = 79326 Total Variable Cost = 79326 * 4.29 / (4.29+2.73) = 48477 Contribution Margin Ratio = 48477 / 88140 = .55 or 55 %
If the ratio of similarity is 310, then the ratio of their area is 96100.