[tex]p\%=\dfrac{p}{100}\\\\\text{increased by 20}\%\to100\%+20\%=120\%\\\\120\%=\dfrac{120}{100}=\dfrac{12}{10}=1.2\\\\1.50\ \text{increased by 20}\%\ \text{is the same as 120}\%\ \text{of}\ 1.50.\\\\120\%\ of\ 1.50\ is\ 1.2\cdot1.50=1.80\\\\Answer:\ \boxed{1.80}[/tex]
