Challenge Your Exam Readiness With Our Free PERT Practice Questions

A 15% increase means multiplying by 1+0.15=1.151 + 0.15 = 1.15. Compute 80×1.15=9280 \times 1.15 = 92. Thus, the new price is $92.00 (option C). An alternative breakdown: 15%15\% of $80 is 0.15×80=120.15 \times 80 = 12; add to the original price to get 80+12=9280 + 12 = 92. PERT Math frequently assesses percentage applications because they model realistic contexts—retail markups, discounts, tax, and tip. The most common pitfalls involve mixing up increase vs. decrease, or applying the percent to the wrong base. Another error is computing 80×0.15=1280 \times 0.15 = 12 correctly but then subtracting instead of adding for an increase. Developing a habit of translating words to an operation—“increase by” ⇒\Rightarrow add the percent; “decrease by” ⇒\Rightarrow subtract the percent—helps maintain accuracy. In multi-step problems (e.g., sequential discounts), carefully track each percentage against the current price.