all three statements are true
step-by-step explanation:
a shipping fee of 5% is charged online with every item purchased online
first let's just take each option and calculate them based on this, to see if the answers matched
keith buys a 40 dollar book
40 x 0.05 = 2
therefore there will be a two dollar fee on keith's book
40 + 2 =42
the first statement is true
a chair costs $80
80 x 0.05 = 4
80 + 4 = 84
the second statement is true
george buys a 20 dollar calculator
20 x 0.05 = 1
20 + 1 = 21
the third statements are true
all three statements are true