In 2021, hyper-arid deserts covered 121212 percent of the world's land surface, at 180018001800 million hectares. Between 1981 and 2021, desertification led to an additional 120120120 million hectares of land being newly classified as hyper-arid desert.
Calculate the percentage of the world's land surface covered by hyper-arid deserts in 1981 to the nearest whole number. You must show your working out.
