Shelley delivered 12 newspapers after 20 minutes and 36 papers after 60 minutes what is the independent variable and the dependent variable and what is the rate of exchange

Answer:The rate of exchange is 8% Step-by-step explanation:Given as :Shelley delivered 12 newspaper after  20 minAnd She delivered 36 papers after 60 minLet the exchange rate = R %So,      Final value = Initial value ×  ( 1 + [tex]\frac{Rate}{100}[/tex] )Or, 36 × 60 =  12 × 20 ×  ( 1 + [tex]\frac{Rate}{100}[/tex] )Or,  2160  = 240 ×  ( 1 + [tex]\frac{Rate}{100}[/tex] )Or,   [tex]\frac{2160}{240}[/tex] =  ( 1 + [tex]\frac{Rate}{100}[/tex] )Or,   9   =  ( 1 + [tex]\frac{Rate}{100}[/tex] )∴     [tex]\frac{Rate}{100}[/tex] = 9 -1 = 8Or , Rate = 8%Hence The rate of exchange is 8%   Answer