Answer:
the weight retain by the roasted coffee beans is 60 % of the initial weight of the coffee beans.
Explanation:
Assume the initial weight of the coffee beans be 'x'
given, 
Roasted coffee beans retains weight 
 = 
 
 
 = 
 
 
 percentage of initial weight the retain will be equal to
 = 
 
 
 = 60% of x
hence , the weight retain by the roasted coffee beans is 60 % of the initial weight of the coffee beans.