The chart below shows the major types of minerals mined in the united states and australia.

country major types of minerals
united states : coal, iron, silver, copper, oil
australia : iron, oil, uranium, silver, lead, zinc, bauxite, coal, copper, gold

based on the chart, what percent of the major types of minerals mined in australia are also mined in the united states?

The chart shows major elements that is found in the United States and Australia.

The minerals like coal, iron, silver, copper, oil are the common type of minerals found in both the countries.

Based on chart Australia contains half of the minerals found in the unites states.

Australia covers around 50% of the minerals that is found in the United States.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

a