Rates for having a manuscript typed at a certain typing service are $5 per page for the first time a page is typed and $3 per page each time a page is revised. If a certain manuscript has 100 pages, of which 40 were revised only once, 10 were revised twice, and the rest required no revisions, what was the total cost of having the manuscript typed?
$430
$620
$650
$680
$770
10页修改两次,是真两次,不是40页的基础上再改一次
只把50页*5,应该是100页都印过一次,然后再校对
想当然地认为那10页是在原来40上上改的
10页跟40页不重叠,。。。。。
没看懂题目!40页——只改一次,30页——改两次
总费用=100*5+40*3+10*(3+3)
10 were revised twice!
5*100+3*40+3*10+3*10 = 680