# Consumer math

• Oct 16th 2011, 11:17 AM
Hellbent
Consumer math
Hi,

I'm not sure of these and need them checked, kindly. Alternatives would be appreciated also :-)

a.) A man sold a car for $22 000 and gained 10% on his money. How much did he pay for the car? M => Amount paid for car$\displaystyle 100 \% + 10 \ % = 110 \%$(Since it's a gain, we add?)$\displaystyle 110 \% \times \rm{M} = 22 000\displaystyle \rm{M} = 22 000 \div 110 \%\displaystyle \rm{M} = \$20 000$

b.) An electric iron was bought for $150 and sold for a profit 10%. What was the selling price?$\displaystyle 100 \% + 10 \ % = 110 \%\displaystyle 110 \% \times 150 = 165 $I got this one after trial and error. My answer just coincides with the given. I don't see the reason for multiplying 1.1 by 150. c.) In a sale the price of a pair of shoes was reduced by$\displaystyle 33 \frac13 \%$. The sale price was$30. What was the original price?

Original Price = Unknown (g)
Sale Price (Final Price) = $30 Loss % =$\displaystyle 33 \frac13\\displaystyle 33 \frac13 \% = \frac13$Relating these is the problem I'm having:$\displaystyle g - \frac13 = \$30$
$\displaystyle \frac{2}{3}g = 30$
g = 45
• Oct 16th 2011, 11:32 AM
zs359142279
Re: Consumer math
They're correct...
• Oct 16th 2011, 08:12 PM
Hellbent
Re: Consumer math
Yeah, thanks.
I don't understand the second problem (b.), as I noted in my original post. Would be glad if someone could clear it up, please!