The usual price of a file sold at Shop U and V is $32. During a sale, a discount of 25% is given to every file sold at Shop U. At Shop V, a discount of 50% is given to the 5th file for every 5 files sold. How much cheaper would it be if Yen buys 12 files from Shop U instead of Shop V?

	Shop U	Shop V
Price of 1 file	75%  $24	100% $32
Every 5th file		50% $16

Price of 1 file from Shop U in percentage
= 100% - 25%
= 75%

Price of 1 file from Shop U at 25% discount
= 75% x 32
= ⁷⁵₁₀₀ x 32 
= $24

Cost of 12 files from Shop U
= 12 x 24
= $288

Price of the 5th file from Shop V in percentage
= 100% - 50%
= 50%

Cost of 5th file at Shop V
= 50% x 32
= ⁵⁰₁₀₀ x 32 
= $16

Cost of 1 set of 5 files at Shop V
= 32 x 4 + 16
= $144

Number of sets of 5 for files at Shop V
= 12 ÷ 5
= 2 r 2

Cost of 2 sets of 5 files at Shop V
= 2 x 144
= $288

Cost of 2 files at Shop V
= 2 x 16
= $32

Cost of 12 files at Shop V
= 288 + 32
= $320

Amount cheaper if Yen buys 12 files from Shop U instead of Shop V
= 320 - 288
= $32

Answer(s): $32