Question 18
A certain type of water bottle is sold at \$10 in both Store A and Store B. Mrs. Lim would like to buy a few water bottles for a Children's Home. Store A sells the water bottle with an offer of “Buy 5 Get 1 Free” (no free bottles for buying fewer than 5 water bottles); store B gives a 15% discount for customers who buy 4 or more water bottles. What is the least amount of money (in \$) that Mrs. Lim needs to spend in order to get 14 water bottles?