A 40% discount on each kilogram of apples would mean the price being 40/100 * 5 = $<<40/100*5=2>>2 smaller.
So one kilogram of apples would cost not $5, but 5 - 2 = $<<5-2=3>>3.
So for 10 kilograms of apples Hannah would pay 3 * 10 = $<<3*10=30>>30.
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