A computer typist types a page with 20 lines in 10 minutes but he leaves 8% margin on the left side of the page.Now he has to type 23 pages with 40 lines on each page which he leaves 25% more margin than before.how much time is now required to type these 23 pages?
Are there answer choices? Here's how I approached it:
1 page, 20 lines, 8% margin, 10 minutes
Of those 20 lines, 8% of the total is blank margin, so the actual amount typed is .92*20=18.4 lines in 10 minutes, or about 1.8 lines per minute.
23 pages, 40 lines, 25% more margin
To figure out out new margin, we simply take the previous amount and add 25% to it: 1.25 * 8 = 10 percent margins.
Using this, we know that 10% of each line is blank, so for 40 lines, the amount typed is 40 * .9 = 36 lines. At a rate of 1.8 lines per minute, each page will take 20 minutes.
All 23 pages will take 23*20 = 460 minutes. Divide by 60 to get to hours and you get 7 2/3 hours.
