Final answer:
The solution to save costs suggested by Rollie Smith and June involves addressing electrical costs and milkshake production time, potentially suggesting more energy-efficient practices or equipment. Kroc's response to such a solution would depend on various factors such as cost, practicality, and impact on quality.
Step-by-step explanation:
The solution proposed by Rollie Smith and his wife June to save hundreds of dollars in electrical costs and reduce time in making milkshakes is not explicitly mentioned in the question. However, if we consider common practices for reducing such costs in the context of food businesses, they might have suggested an alternative like using a premixed milkshake solution that does not require refrigeration or exploring modern refrigeration systems that are more energy efficient to lower electricity consumption.
Kroc’s response to the solution is also not detailed in the question. Typically, a business owner or operator like Ray Kroc may react to cost-saving measures in different ways depending on the practicality, financial viability, and potential impact on product quality. His response might range from enthusiastic adoption if the solution improved efficiency without compromising quality, to skepticism or refusal if it threatened the brand’s standard or required significant upfront investment.