Apple can refuse to accept cash. What you have stated is only true for debts. Purchasing an iphone is clearly does not fall into this category.
Coinage Act of 1965, Section 31 U.S.C. 5103, entitled "Legal tender," states: "United States coins and currency (including Federal reserve notes and circulating notes of Federal reserve banks and national banks) are legal tender for all debts, public charges, taxes, and dues."
Apple can refuse to accept cash. What you have stated is only true for debts. Purchasing an iphone is clearly does not fall into this category.
Coinage Act of 1965, Section 31 U.S.C. 5103, entitled "Legal tender," states: "United States coins and currency (including Federal reserve notes and circulating notes of Federal reserve banks and national banks) are legal tender for all debts, public charges, taxes, and dues."
http://www.treas.gov/education/faq/currency/legal-tender.shtml