Chet discovered the use of gratis in sales promotion.
Explanation:
Chet is a businessman , he is facing problem when he was selling his golf photography outside golf tournament event. The sales were poor , when he applied an alternative techniques the sales were high that is when he added other product along with the golf photography that is a t-shirt with a golf photograph on it and as a result it attracted many buyers as now the buyers can utilize the T- shirt and Chet creativity will also be valued.