Fast-food giant McDonald's contributes £170 million a year to the Scottish economy through its business and suppliers, according to a new report.

The independent economic report Serving the UK: McDonald's at 40 assessed the overall contribution the chain has made to the UK economy since it first started operating in the UK in 1974.

It found that in Scotland, McDonald's supports around 9,100 jobs directly and indirectly, including at major suppliers such as Smith Anderson in Kirkcaldy, Fife, Arla Foods in Dumfries and Galloway, and Pacific Building - a construction firm in Glasgow.

The report found Scotland-based businesses sold almost £90 million of goods and services into the McDonald's supply chain in 2013.

Around £10 million of agricultural produce is supplied from Scotland, including seed potatoes, milk and beef.

McDonald's opened its first Scottish restaurant in Dundee in 1987 and now has 94 outlets in Scotland, employing 6,900 people with a further 2,200 jobs supported through the supply chain.

The company said that its continued growth in Scotland has also enabled local suppliers to grow, innovate and diversify.

Among them is Smith Anderson, an independent family-owned business based in Kirkcaldy which supplies paper bags for all 1,200 UK restaurants and is the longest serving supplier to the British business, employing more than 200 people with a turnover in excess of £20 million.

The report was researched by Development Economics.