1. A storekeeper has bought the following:
Number of steel plates
January
250
February
110
March
90
Price each (N$)
N$2,54
N$3,59
N$3,87
(a) Calculate the average price paid for a steel plate over the period of January - March
(b) What was the total price paid for the steel plates?

(a) and (b)

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %