The figure below show a castling with dimensions given in mm. What is the mass of the casting in kg if it is made of iron of density 7.2g/cm³

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)