A court reporter operates an electronic typewriter at 60 words per minute and a word processor at 70 words per minute. When using a typewriter, the reporter makes errors in 2 % of the words, and when using a word processor, the reporter makes errors in 1 %. What is the difference in number of errors made per hour on the two machines?
explain the steps
typewriter for 1 hour
.02 * 60 =1.2 errors/minute
* 60 min/hour = 72 errors/hour
processor
.01 * 70 = 0.7
* 60 = 42 errors/hor
72 - 42 = 30 approximately