This study aims to determine the effect of Net Profit Margin and Total Asset Turnover on Return On Asset of PT Astra Otoparts Tbk in the period 2014 - 2024. This study uses secondary data obtained from the company's annual financial statements. The approach used is a quantitative method. Data analysis used is descriptive statistics, classical assumption tests, multiple linear regression, coefficient of determination tests, partial tests (t-test), and simultaneous tests (F-test), with the help of SPSS software version 25. The results of the study found that Net Profit Margin partially has a significant effect on Return On Asset, indicated by a significant value of 0.000 <0.05 and a calculated t value of 31.675> t table 2.306. While Total Asset Turnover shows partially has a significant effect on Return On Asset, with a significant value of 0.031 <0.05 and a calculated t value of 2.621> t table 2.306. Simultaneously, the Net Profit Margin and Total Asset Turnover variables have a significant effect on Return on Assets with a significance value of 0.000 < 0.05 and F count of 781.061 > 4.256.
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