Question

Approximately what percent of the Sahara Desert is covered by sand sheets and dunes?

Answer

About 10%

About 25%

About 50%

All of the Sahara Desert is covered by sand sheets and dunes.

Answer 1

I am absolutely sure that the percent of the Sahara Desert is covered by sand sheets and dunes is definitely 25 %. Even though it might seem weird, it is actually correct and here are the pic from artcicle about Sahara which will pose as a proof : )
Do hope it will help!