Final answer:
Calculating the weight of kidney beans to be added at $0.89 per kg to reach a total value of $81, after accounting for 40kg of pinto beans at $0.69 per kg, requires correcting improper values or options.
Step-by-step explanation:
Victor has 40kg of pinto beans that cost $0.69 per kg. The total cost of the pinto beans is 40kg * $0.69/kg = $27.60. Victor wants the entire mixture of pinto beans and kidney beans to have a value of $81. Since $27.60 is already allocated to the pinto beans, the value left for kidney beans is $81 - $27.60 = $53.40. Kidney beans cost $0.89 per kg.
To find the number of kilograms of kidney beans needed, we divide the total cost allocated for kidney beans by the price per kg: $53.40 / $0.89/kg = 60 kg of kidney beans. This seems to contradict the multiple-choice answers provided because they are all less than 60 kg. Therefore, there might be an error in the multiple-choice options, or in our calculations based on the question as stated.
However, to answer the question according to the provided choices, none of them are correct since 60 kg is not an option. So in this case, we would need to go back and check for any mistakes either in the calculations or in the information provided.