Consumer Arithmetic

$15\% = 0.15$, and $0.15 \times 240 = 36$.

The profit is $\$15$. As a percentage of the cost price: $\dfrac{15}{60} \times 100 = 25\%$.

$\dfrac{PRT}{100} = \dfrac{4000 \times 5 \times 3}{100} = 600$.

There are $4 + 5 = 9$ parts, so one part is $450 \div 9 = \$50$. The shares are $4 \times 50 = \$200$ and $5 \times 50 = \$250$, which add back to $\$450$.

$5000 \times 1.06^3 = 5000 \times 1.191016 = \$5955.08$.

Basic: $40 \times 18 = \$720$. Overtime rate is $1.5 \times 18 = \$27$, and there are 6 overtime hours: $6 \times 27 = \$162$. Total $\$882$.