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The answer should be USD 11.40. 

you just need to multiply USD 456 by 2 1/2 percent of tax:

456 x 2 1/2 % convert the percent to decimal 
456 x 0.025 
11.40

Answer:$11.625

Step-by-step explanation:

2 1/2 % of $456

(2 1/2 / 100 ) × $456

2 1/2 = 5/2 = 2.5

2 1/2 / 100 = 2.5 / 100 = 0.025

Therefore,

(2 1/2 / 100 ) × $456

= 0.025 × $456

=$11.625