The lowest bar identifies the weakest year directly, and the percentage increase compares the first and last years' figures against the 2019 base.

Lowest: 2020 (60 cars). Increase $=130-80=50$; percentage $=\frac{50}{80}\times100=62.5\%$.

Step 1 — Draw the simple bar diagram. Mark the five years on the X-axis, cars sold on the Y-axis, and draw five equal-width bars from a zero baseline with heights 80, 60, 95, 110, 130.

Step 2(a) — Find the lowest bar. Comparing $80, 60, 95, 110, 130$, the smallest is $60$, in 2020.

Step 2(b) — Compute the percentage increase, 2019 to 2023.

Independent check. Verifying the percentage a second way: $80\times1.625 = 80 + 80\times0.625 = 80+50=130$ — multiplying the 2019 figure by $(1+62.5\%)$ correctly reproduces the 2023 figure, confirming the percentage.

Computing the percentage increase against the wrong base (e.g. dividing by 130 instead of the correct original-year figure, 80) gives a materially different, wrong percentage — the base of a percentage-increase calculation is always the EARLIER value.