Problem of the Day 82

James was given some alarm clocks and 30 patches to sell during a charity fund raising project. He was supposed to sell each alarm clock for €15.50 and each patch for €2.30. Instead, James worked out a plan in order to avoid accepting coins. He sold each clock for €16 and each patch for €2. James collected the same amount of money using the new prices as he would have with the old prices. How many alarm clocks did James sell?