Aspark plug listed at $1.89, marked down 29%

$1.34

Step-by-step explanation:

The price of a spark plug = $1.89

It was marked down = 29%

29 percent of 1.89 = 29% × 1.89

                              =

                              = 0.29 × 1.89

                              = 0.5481 ≈ $0.55

The new price of spark plug = 1.89 - 0.55

                                               = $1.34

The new price after 29% marked down is $1.34.

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points