A deadly nightshade plant has chlorosis (yellow leaves). The mass of chemical A found in the leaves of the plant is 60% of the mass shown in Table 1. Calculate the mass of chemical A in 200 g of the leaves with chlorosis. Give your answer in mg.

This is a multi-step calculation. 1. **Find the starting mass:** From Table 1, the mass of chemical A in 100 g of healthy leaves is 1.2 g. 2. **Calculate the effect of chlorosis:** The leaves with chlorosis have 60% of this mass. To find 60%, you multiply by 0.60. So, 1.2 g × 0.60 = 0.72 g. This is the mass in 100 g of chlorotic leaves. 3. **Scale up to 200 g:** The question asks for the mass in 200 g of leaves. Since 0.72 g is the mass in 100 g, we multiply by 2. So, 0.72 g × 2 = 1.44 g. 4. **Convert units:** The final answer must be in milligrams (mg). There are 1000 mg in 1 g. So, 1.44 g × 1000 = 1440 mg.