Understand your clients' spend and budget.
It may seem a strange question. But think about it. How much does a coffee cost these days - £2.50 or a little more maybe? And how often do people pop into their favourite café for a tall skinny latte or a cappuccino?
Take a look at the list below. They are things people buy almost without thinking. They cost so little, but as you'll see if you use the calculator, they soon add up.