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An investor has an account with stock from two different companies. Last year, his stock in Company A was worth 
$2640 and his stock in Company B was worth 
$3300. The stock in Company A has decreased 20% since last year and the stock in Company B has decreased 
21%. What was the total percentage decrease in the investor's stock account? Round your answer to the nearest tenth (if necessary).
Answer:

An investor has an account with stock from two different companies. Last year, his stock in Company A was worth $2640 \$ 2640 and his stock in Company B was worth $3300 \$ 3300 . The stock in Company A has decreased 20%20\% since last year and the stock in Company B has decreased 21% 21 \% . What was the total percentage decrease in the investor's stock account? Round your answer to the nearest tenth (if necessary).\newlineAnswer:

Full solution

Q. An investor has an account with stock from two different companies. Last year, his stock in Company A was worth $2640 \$ 2640 and his stock in Company B was worth $3300 \$ 3300 . The stock in Company A has decreased 20%20\% since last year and the stock in Company B has decreased 21% 21 \% . What was the total percentage decrease in the investor's stock account? Round your answer to the nearest tenth (if necessary).\newlineAnswer:
  1. Calculate Company A Stock: Calculate the new value of the investor's stock in Company A after a 2020\% decrease.\newlineOriginal value of Company A stock: $2640\$2640\newlinePercentage decrease: 20%20\%\newlineDecrease in value: $2640×0.20=$528\$2640 \times 0.20 = \$528\newlineNew value of Company A stock: $2640$528=$2112\$2640 - \$528 = \$2112
  2. Calculate Company B Stock: Calculate the new value of the investor's stock in Company B after a 2121\% decrease.\newlineOriginal value of Company B stock: $3300\$3300\newlinePercentage decrease: 21%21\%\newlineDecrease in value: $3300×0.21=$693\$3300 \times 0.21 = \$693\newlineNew value of Company B stock: $3300$693=$2607\$3300 - \$693 = \$2607
  3. Calculate Total Original Value: Calculate the total original value of the investor's stock account.\newlineTotal original value = Value of Company A stock + Value of Company B stock\newlineTotal original value = $2640\$2640 + $3300\$3300 = $5940\$5940
  4. Calculate Total New Value: Calculate the total new value of the investor's stock account.\newlineTotal new value = New value of Company A stock + New value of Company B stock\newlineTotal new value = $2112\$2112 + $2607\$2607 = $4719\$4719
  5. Calculate Total Decrease: Calculate the total decrease in value of the investor's stock account.\newlineTotal decrease = Total original value - Total new value\newlineTotal decrease = $5940\$5940 - $4719\$4719 = $1221\$1221
  6. Calculate Total Percentage Decrease: Calculate the total percentage decrease in the investor's stock account.\newlineTotal percentage decrease = (Total decrease/Total original value)×100%(\text{Total decrease} / \text{Total original value}) \times 100\%\newlineTotal percentage decrease = ($1221/$5940)×100%(\$1221 / \$5940) \times 100\%\newlineTotal percentage decrease = 0.2055×100%0.2055 \times 100\%\newlineTotal percentage decrease = 20.55%20.55\%\newlineRound to the nearest tenth: 20.6%20.6\%