[計量] pp2-137
137.
Connie paid a sales tax of 8 percent on her purchase. If the sales tax had
been only 5 percent, she would have paid $12 less in sales tax on her purchase.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
What was the total amount that Connie paid for her purchase including sales tax
?
(A) $368
(B) $380
(C) $400
(D) $420
(E) $432
ansE
設x為原價。
1.08x = 1.05x+12
^^^^^^^^
我不懂為啥要加12?就題目來看，不是少12嗎?
有人可以幫解答嗎?
謝謝!!!
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