Finish quick please:

2. A new product has just come onto the market and is a big hit. The success, however, does not last too long. Within a year, sales/day have dropped drastically. Given that the number of sales/day, measured in tens of thousands, of the product is represented by the function n(t)=50(e'\"e'3')after t years, what is the day that the most products are sold? How many products were sold on that day? [5 marks]