Tea Tree furniture is offering a Bulk Buy discount for the newly arrived desk and chair set ticketed at $350. For any purchase over 50 sets, the following discount rule is applicable: a) $20 off per set for the first 20 sets; b)15% off for all the remaining sets.

1. Yolanda is to be issued an invoice of $21, 475 for her planned purchase. Will she be qualified for the discount? If so, how many sets did she purchase based on the above discount rule?

2. Far North furniture stocks the same desk and chair set ticketed at a higher price of $390 compared to Tea Tree furniture. However, Far North furniture offers a 20% discount on any purchase over 30 sets. Will Far North furniture be a better option for Yolanda? Explain in 2-3 sentences.