Question 302180
30% sale from its original price of 10 dollars: 

(30/100)* $10 = $3
Ken buys the shirt for $3.

60% increase from the price, this means:

(60/100) * $3 = $1.20 
$1.20 + $3 = $ 4.20 
Ken sell the shirt for $4.20 

Answer: (a)