On April 1, the price of gas at Bob’s Corner Station was $3.80 per gallon. On May 1, the price was $4.30 per gallon. On June 1, it was back down to $3.80 per gallon.

Question

Between April 1 and May 1, Bob’s price increased by ($0.50 or $4.30 or $3.80), or (11.63% or 13.16% or 111.63%, or 88.37%)
Between May 1 and June 1, Bob’s price decreased by ($0.50 or $3.80 or $4.30) or (88.37% or 13.16% 111.63% or 11.63%)

Answer 1

To calculate the increases and decreases in the price of gas at Bob’s Corner Station, we can analyze the changes from one date to another.

1. Between April 1 and May 1:

   • Price on April 1: $3.80
   • Price on May 1: $4.30
   • Increase in price: $4.30 - $3.80 = $0.50

   To find the percentage increase: \[ \text{Percentage Increase} = \left( \frac{\text{Increase}}{\text{Original Price}} \right) \times 100 = \left( \frac{0.50}{3.80} \right) \times 100 \approx 13.16% \]

   Answer:

   • Between April 1 and May 1, Bob’s price increased by $0.50 (option) or 13.16% (option).

2. Between May 1 and June 1:

   • Price on May 1: $4.30
   • Price on June 1: $3.80
   • Decrease in price: $4.30 - $3.80 = $0.50

   To find the percentage decrease: \[ \text{Percentage Decrease} = \left( \frac{\text{Decrease}}{\text{Original Price}} \right) \times 100 = \left( \frac{0.50}{4.30} \right) \times 100 \approx 11.63% \]

   Answer:

   • Between May 1 and June 1, Bob’s price decreased by $0.50 (option) or 11.63% (option).

Thus, the final answers are:

1. Between April 1 and May 1: increased by $0.50 or 13.16%.
2. Between May 1 and June 1: decreased by $0.50 or 11.63%.