<span>Apprentice B earns $120 because Apprentice A's wage is $4/hour (160 divided by 40), and the question states that they are paid at the same scale. Therefore 4 x 30 = $120.</span>
this gives
total area of the field = 4655 sqyrd + 1884.79 sqyrd = 6539.79 sqyrd cost of fertilising 1 sqyrd = $ 0.08 so cost of fertilising 6539.79 sqyrd = 6539.79 * $ 0.08 = $ 523.18