118) At what rate percent compound interest does a sum of money become four-fold in 2 Years?
Answer is:
100%
Related RRB SSE Mechanical Question Paper 2014 (Set-1) with Answer Key
Answer is:
Anthracite
Explanation:
Anthracite, also known as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.