We can find the original value of the apple by dividing 5 by 3.98. Now we know that one pound of apple costs $0.80. WAIT. That's not it!!! Now we can multiply that value by 18 to get the cost, which is $14.40. Pretty cheap, if you ask me.
21.2264 is 21.2 rounded to the nearest tenths; the place after the decimal is there tenths place so in the hundreths place, the number 2 is less than 5 therefore rounding it to 2.
