it costs 91.20 to fill a 20 gallon tank. it costs 54.72 to fill a 12 gallon tank. what is the constant of proportionality?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

Need showing work for this problem 56.25 ×25.80