An item with cost, c, is discounted by 30%.

Which expressions represent the final cost of the item?

Select all that apply. (more than one answer)

c(1−0.3)
c(0.3)
c(1+0.3)
1.03c
0.7c
0.3c

Which expressions represent an increase of 5% on the value x?

Select all that apply. (more than one answer)

1.5x
x(1−0.05)
x(1+0.5)
0.95x
x(1+0.05)
1.05x

The following equation represents a percent change on the value, x.

x+0.25x=1.25x

How can you describe this in words?
A decrease of 25% is the same as multiplying by 1.25.
An increase of 25% is the same as multiplying by 1.25.
A decrease of 25% is the same as multiplying by 0.25.
An increase of 25% is the same as multiplying by 0.25.