Posted by alan on Tuesday, January 15, 2013 at 12:11am.
LinYee is helping to set up a health clinic in Inuvik by collecting and shipping medical supplies from Calgary. She has found these shipping rates online:
• regular rate: $2.10/lb
• ship 101 to 500 lb, get a 20% discount
• ship over 500 lb, get a 40% discount
A large medical supply company has promised to donate 12 hospital beds and 4 wheeled stretchers over four months. Each bed weighs 58 kg and each stretcher weighs 90 lb.
a) How much will it cost total if she ships a quarter of the equipment (three beds and one stretcher) each month?
b) How much will it cost total if she ships half the equipment every two months?

math  Henry, Wednesday, January 16, 2013 at 9:14pm
3Beds * 58kg/Bed * 1Lb/0.454kg=383 Lbs
= Wt. of the Beds.
90 Lbs. = Wt. of stretcher.
Total Wt = 383 + 80 = 473 Lbs.
Cost = 2.10/Lb*473Lbs  20% Discount.
Cost = 993.30  0.20*993.30 = $794.64.
Total cost = 4 * 794.64 = $3178.56
b. 6Beds*58kg/Bed * 1Lb/0.454kg=767 Lbs
= Wt. of the Beds.
2 * 90 = 180 Lbs = Wt. of the stretchers.
Tot. Wt. = 767 + 180 = 947 Lbs.
Cost = P  0.4P = 0.6P.
Cost = 0.6 * 2.10/Lb*947Lbs = $1193.22
Tot. Cost = 2 * 1193.22 = $2386.44.