A man decides to buy a nice horse. He pays $60 for it, and he is very content with the strong animal. After a year, the value of the horse has increased to $70 and he decides to sell the horse. However, already a few days later he regrets his decision to sell the beautiful horse, and he buys it again. Unfortunately, he has to pay $80 to get it back, so he loses $10. After another year of owning the horse, he finally decides to sell the horse for $90.
What is the overall profit the man makes?  Choose the correct choice from the following:
A) $70
B) $70
C) $20
D) $89
E) $68
C   $20   n the first trade, the man buys something for $60 and sells it again for $70, so he makes a profit of $10.   In the second trade, the man buys something for $80 and sells it again for $90, so he makes again a profit of $10.   Conclusion: The man makes an overall profit of $10 + $10 = $20.   You can also look at the problem as follows: the total expenses are $60 + $80 10 +  10= 
<gadget id="calculator">10 +  10</gadget>
<output>20</output>
$20.   You can also look at the problem as follows: the total expenses are $60 + $80 = $140 and the total earnings are $70 + $90 60 +  80= 
<gadget id="calculator">60 +  80</gadget>
<output>140</output>
$140 and the total earnings are $70 + $90 = $160. The overall profit is therefore $160 - $140   70 +  90= 
<gadget id="calculator">  70 +  90</gadget>
<output>160</output>
$160. The overall profit is therefore $160 - $140 = $20. 160 -  140= 
<gadget id="calculator"> 160 -  140</gadget>
<output>20</output>
$20.
<result>C</result>
A man decides to buy a nice horse. He pays $60 for it, and he is very content with the strong animal. After a year, the value of the horse has increased to $70 and he decides to sell the horse. However, already a few days later he regrets his decision to sell the beautiful horse, and he buys it again. Unfortunately, he has to pay $80 to get it back, so he loses $10. After another year of owning the horse, he finally decides to sell the horse for $90.
What is the overall profit the man makes?