All categories

3 years ago

Work out the percentage change when a price of £65 is decreased to £39.

Mathematics

2 answers:

Nadya [2.5K]3 years ago

6 0

Answer:

40% decrease

Step-by-step explanation:

Say the percent decrease is x%. Then, we can write the equation:

65 - x% * 65 = 39

Notice that 65 is a common factor of both terms on the left, so factor that out:

65 * (1 - x%) = 39

Divide by 65 on both sides:

1 - x% = 0.6

Subtract 0.6 from and add x% to both sides:

x% = 0.4

Remember that % simply means "out of 100", so x% = x/100:

x/100 = 0.4

Multiply by 100:

x = 40

So the percentage decrease is 40%, or the percent increase is -40% (whichever way the question asks).

Hope this helps!

Zigmanuir [339]3 years ago

6 0

Answer:

p = 40%

Step-by-step explanation:

65 - p%65 = 39

65 - 65p/100 = 39

6500 - 65p = 3900

6500 - 3900 = 65p

65p = 2600

p = 2600 : 65

p = 40%

You might be interested in

A line passes through the points (0,3), (4,1) and (6,0). Which function best represents the relationship between the two points?

Veronika [31]

Answer:

y = - $\frac{1}{2}$ x + 3

Step-by-step explanation:

y = mx + b

m = $\frac{y_{2} -y_{1} }{x_{2} -x_{1} }$ and "b" is y-intercept with coordinates (0, b)

(0, 3) ⇒ b = 3

(4, 1), (6, 0)

m = $\frac{0-1}{6-4}$ = - $\frac{1}{2}$

y = -  $\frac{1}{2}$  x + 3

8 0

3 years ago

Simplify the equasion √(a+b)^2

kipiarov [429]

It’s just a + b i think since the square root and the square cancel each other out

4 0

3 years ago

Read 2 more answers

What is the input value for which f(x)=3?

grandymaker [24]

Answer:

According to the graph −3 is the point (5,−3)left parenthesis, 5, comma, minus, 3, right parenthesis. In other words, f(5)=−3f, Therefore, the answer x=5

4 0

3 years ago

Read 2 more answers

Help needed ASAP will give brainliest and 5 STARS RATE

Troyanec [42]

Answer:

Step-by-step explanation:

6 0

3 years ago

Show all your work to receive full credit for this problem. Solve the system of equations using the elimination method. 2a + 3b

Sindrei [870]

Given equations are;
2a + 3b = -1 ..................equation 1
3a + 5b = -2 ....................equation 2

Now multiply equation 1 with (-3)

The equation will be;

-6a -9b = 3 …………………..equation 3

Now multiply equation 2 with (2)

The equation will be;

6a + 10b = -4 ……………..equation 4

Now add equation 3 and equation 4

-6a – 9b = 3

6a + 10b = -4

------------------------------

0a + b = -1

b = -1

Now put the value of b in equation 1

2a + 3(-1) = -1

2a -3 = -1

2a = -1+3

2a = 2

a=1

Thus the solution is (a,b) = (1,-1)

8 0

3 years ago