How many square meters does it take to build a 50-meter-long and 4-meter-wide plastic runway in xinhua primary school with a thickness of 10cm?

There seems to be something wrong with the topic, but it should be for you to calculate the surface area. So 10cm=0.1m, then 50× 4× 2 = 400 0.1× 50× 2 = 100.1× 4× 2 = 0.8, and finally 400 10 0.8=410.8.