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Answer and Solution:
Face Mask
1 box - PHP 120
Discount - 15% (0.15)
Discount per box - PHP 120 * 0.15 = PHP 18
Total amount you pay per box - PHP 120 - PHP 18 = PHP 102
Face Shield
1 piece - PHP 75
Discount - 12% (0.12)
Discount per piece - PHP 75 * 0.12 = PHP 9
Total amount you pay per piece - PHP 75 - PHP 9 = PHP 66
Face mask (100 boxes) and Face shield (100 pieces)
Amount to pay:
Face mask
PHP 102 * 100 = PHP 10,200
Face Shield
PHP 66 * 100 = PHP 6,600
Final Answer (How much you will pay in all):
PHP 10,200 + PHP 6,600 = PHP 16,800
Discount:
Face mask
PHP 18 * 100 = PHP 1,800
Face shield
PHP 9 * 100 = PHP 900
Final Answer (How much is your discount):
PHP 1,800 + PHP 900 = PHP 2,700