How to find cost price in a problem concerning discount? [closed]

A dealer is selling an article at a discount of 5% on the marked price. (1) What is the selling price, if the marked price is 140.

(2) What is the cost price, if the marked price is 12% above the cost price?

i've got the first answer using the formula: Net SP= (100-D%)/100 * MP

so, SP=95/100 * 140 = 133

But now how do i proceed with the second question?

-

closed as off-topic by Najib Idrissi, Adriano, drhab, Giuseppe Negro, Daniel FischerJul 31 at 10:43

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – Najib Idrissi, Adriano, drhab, Giuseppe Negro, Daniel Fischer
If this question can be reworded to fit the rules in the help center, please edit the question.

What have you tried? –  user5137 Aug 25 '12 at 6:56
@ Jack Maney nothing yet –  Ghost Aug 25 '12 at 6:58
Then try something. Hint: those blue-ish words? They're a link. Click on it. Read the page to which the link points. Stop being a help vampire. –  user5137 Aug 25 '12 at 7:00
@ Jack Maney i don't think i'd like to read a whole page on how to try to solve questions before asking them...and if something did occur to me, don't you think i would have tried it myself? –  Ghost Aug 25 '12 at 7:03
Admittedly, it is quite annoying that you are unwilling to read a 'whole page' before asking people you don't know to give up some (not much) of their time to help you. –  Chris Dugale Aug 25 '12 at 7:05

You can solve this problem in virtually the same way you solved the previous problem. We have that $MP=\frac{100+12}{100}CP$ So, $CP=?$
Well, you're right: it is different, but the technique used in the 1st is still very relevant. You need not take into account the discount in the 2nd part, but you still need an expression for what a certain quantity is given that it is a multiple of a known one. i.e If x is 50 percent more than y, then x=1.5y, or $\frac{100+50}{100}$. –  Chris Dugale Aug 25 '12 at 7:04