If 20% annual GDP growth were achieved in the developing world, sub-Saharan Africa would reach China's current per-capita GDP in 5-10 years.

This is a conditional arithmetic prediction, so judge it by calculation rather than by real-world growth. Use sub-Saharan Africa's and China's per-capita GDP as of 2015 (World Bank or IMF figures). Compute the years needed for SSA to reach China's 2015 level at 20% compound annual growth: n = ln(China/SSA) / ln(1.2). The claim does not specify a basis, so check both nominal US dollars and PPP. TRUE: n falls between 5 and 10 years on both bases, or on one common basis with the other within about half a year of the range. MOSTLY TRUE: n is within 5–10 on one standard basis (nominal or PPP) and just outside on the other (within about one year). MIXED: n is within range on one basis and clearly outside on the other. MOSTLY FALSE: n is outside 5–10 on both bases but within about one year of the range. FALSE: n is more than about one year outside the 5–10 range on both bases.

Set before the research began.

1. E1 WorldStat - statistics for education WorldStat (secondary site citing World Bank Data) · September 2016

   “| Sub-Saharan Africa | 1640 | 1902 | 3166 | 3695 |”

2. E2 WorldStat - statistics for education WorldStat (secondary site citing World Bank Data) · September 2016

   “| China | 980 | 2915 | 9239 | 14239 |”

E2 and E3 give GDP-per-capita table rows for sub-Saharan Africa and China. The quotes do not include the basis (nominal or PPP) or the year column headers, so no figure can be confirmed as the 2015 value. If the last column were 2015 (3695 vs 14239), the PPP calculation would give about 7.4 years at 20% growth, but that column assignment is unverified. No nominal-dollar figures are provided, and the criteria require checking both bases. The evidence therefore does not settle the calculation.