help with question

You purchased $1000 worth of inventory on credit on day o. You paid the bill 40 days later. After 30 more days, someone buys the $1000 in inventory for $1400. Your buyer does not actually pay for another 45 day. The cash cycle is and inventory period is a) 65 days; 70 days b) 75 days; 70 days c) 65 days; 60 days d) 75 days; 60 days