1)In an year the value of a motorcycle depreciates by 10% of its value at the beginning of that year. What is its value after two years if the purchased price was $7200? 2)When John Short increases the spend at which he motors from an average of 40mph to 50mph, the number of miles travelled per gallon decreases by 25%.If he travels 36 miles on each gallon when his average speed is 30 mph how many miles per gallon can he execpt at an average speed of 50mph?