lock-box system is estimated to be $50,000 and the company's required rate of return on short-term investments is 5 percent. (a) What is the amount of reduction in cash balances that would be realized through the adoption of a lock-box system? (b) What is the opportunity cost in dollars of the current system? (c) Should the company adopt its proposed lock-box system? lock-box system is estimated to be $50,000 and the company's required rate of return on short-term investments is 5 percent. (a) What is the amount of reduction in cash balances that would be realized through the adoption of a lock-box system? (b) What is the opportunity cost in dollars of the current system? (c) Should the company adopt its proposed lock-box system