A store sells tents, sleeping bags, and camp stools. A customer buys a tent, 3 sleeping bags, and 3 camp stools for $220. The price of the tent is 7 times the cost of a camp stool. The cost of a sleeping bag is $30 more than the cost of a camp stool. Find the cost of each item.
◦ $70 for a tent; $40 for a sleeping bag; $10 for a camp stool
◦ $77 for a tent; $40 for a sleeping bag; $11 for a camp stool
◦ $70 for a tent; $40 for a sleeping bag; $11 for a camp stool
◦ $70 for a tent; $45 for a sleeping bag; $15 for a camp stool