Answer:
Part a is missing, so I looked for a similar question:
the formula that we use to calculate the retail price = x · (100% + 80%) = x · 180% = 1.8x
retail price:
Q 0-20 pairs 21-40 pairs 41-60 pairs 61-80 pairs 81 or more
W. price $25.00 $23.00 $21.00 $19.00 $17.00
Retail $45.00 $41.40 $37.80 $34.20 $30.60
price (per pair)
to find the retail price:
$25 x 1.8 = $45
$23 x 1.8 = $41.40
$21 x 1.8 = $37.80
$19 x 1.8 = $34.20
$17 x 1.8 = $30.60