To solve problem, first find the percentage of drives that fail. This is simple because 5 of every 100 fail. which is 5/100. A percentage can be expressed as a number over 100
5 of 100 or 5% of all drives fail
multiply this 5% by the 1040 drives to find out how many of the 1040 drives fail.
convert the percentage to a decimal by moving the decimal point two places to the left to get .05 times 1040
52 of the 1040 drives will fail.