a)
[tex]80 \times 15\% = \frac{80 \times 15}{100} = \frac{1200}{100} = 12[/tex]
[tex]80 + 12 = 92[/tex]
b)
[tex]160 \times 0.5\% = \frac{160 \times 0.5}{100} = \frac{80}{100} = 0.8[/tex]
[tex]160 \times 0.8 = 128[/tex]
c)
[tex]104 \times 85\% = \frac{104 \times 85}{100} = \frac{8840}{100} = 88.4[/tex]
[tex]104 - 88.4 = 19.6[/tex]
d)
[tex]240 \div 2 = 120[/tex]
[tex]120 \times 30\% = \frac{120 \times 30}{100} = \frac{3600}{100} = 36[/tex]
[tex]240 + 36 = 276[/tex]
