Work out the percentage change when a price of £20 is increased to £50.

150%

Step-by-step explanation:

Let's say the 20 increased by x%. Then, we can write the equation:

20 + x% * 20 = 50

Notice that both terms on the left side have 20, so we can factor this out:

20 * (1 + x%) = 50

Divide both sides by 20:

1 + x% = 50/20 = 2.5

Subtract 1 from both sides:

x% = 1.5

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

x/100 = 1.5

Multiply both sides by 100:

x = 150

Thus, the percent increase is 150%.

Hope this helps!

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.