May I ask a favor of you?

May I ask a favor of you?
1.Our factory is much more productive now.
This year's production is five times
______ it was fifteen years ago.
a.that b.than c.what.d.as
2.To save money from my education,mother
often takes on more work than _____ good
for her .
a.to be b.is c.what is d.which is
以上两题应选那个选项,请给出详解.
Thank you for your kindenss.
看来是书上的答案错了，我和你们选的一样，再看看有没有谁有不同的答案。