7 questions need help with (complicated)

Could you help me with this please? thank you

1 This is going to cause me 200000 dollars/going to cause me to lose 200000 dollars.
2 Thats a wide/generous estimation. (what word would you use?)
3 She said she'd rent me the apartment so easily, without a fuss, you'd think that she was ripping you off.
4 Help me arrange the furniture so as to save as much space as possible./so as to make good use of the space/make the most of the space.
5 She's the only teacher that doesn't annoy me about my student ID not having my picture.
6 I'll pay you what I can.
7 Putting a parquet in an apartment makes the apartment lighter. (does that make sense?) as in Parquet makes the apartment look like its brighter. (how would you say it?)
8 The picture is taken in a way that makes you think its bigger than it actually is, its an optical illusion. (is it an optical illusion?)

Thank you