2 years ago

Need help on this please

Mathematics

2 answers:

kotykmax [81]2 years ago

5 0

1 or4 maybe 3 try one of those

raketka [301]2 years ago

5 0

It is the same as (4x+1)(4x-1) all over x(4x-1) you can cancel the 4x-1
You get (4x+1)/x
As stated by all the answers x≠0 as you would have 0 as a denominator which is a criminal offence. Lets see if 1/4 works.
(4(0.25)+1)/0.25 =1+1/0.25
2/0.25 = 8
This works fine the answer is D

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A shopkeeper allows 15% discount on the marked price, still he manages to have 7% profit. How much high did he mark his goods ab

lianna [129]

Answer: $25.9\%$

Step-by-step explanation:

Given

Shopkeeper allows 15% discount on the marked price and still manages a profit of 7%

Suppose the marked price is $x$

So, the selling price is $(1-0.15)x=0.85x$

Suppose the cost price is $y$

$\Rightarrow \dfrac{0.85x-y}{y}=7\%\\\\\Rightarrow \dfrac{0.85x}{y}-1=0.07\\\\\Rightarrow \dfrac{0.85x}{y}=1.07\\\\\Rightarrow y=\dfrac{0.85x}{1.07}\\\\\Rightarrow y=0.794x$

So, the percentage the shopkeeper marked his goods above cost price

$\Rightarrow \dfrac{x-y}{y}\times 100\\\\\Rightarrow \dfrac{x-0.794x}{0.794}\times 100\\\\\Rightarrow \dfrac{0.2056}{0.794x}\times 100\\\\\Rightarrow 25.89\%\approx 25.9\%$