This study aims to determine the Application of Differential Costs in Decision Making to rent or buy fixed assets (musical instruments) in the field of musical instrument rental. This type of research is quantitative research. Data is obtained through primary and secondary data. This research was conducted in 2020 to 2022. Data collection techniques through interviews and documentation. Data analysis techniques are carried out by identifying data on interview costs, observations and documentation at the New Arista Orchestra. Based on the results of the analysis, these relevant costs can be used as considerations for the company in making decisions. With the alternative of buying, it will save costs of IDR 76,257,322.93 or 2.7% in making decisions with the alternative of buying or renting heavy equipment, it is better to consider the expenses that will be incurred from the two alternatives with relevant costs so that the decisions taken can benefit the company. The results of the comparison using the differential costs above. it can be concluded that differential cost analysis is very useful for the new Orchestra in making better decisions taken by the orchestra is to buy because it is more profitable than renting musical instruments.

This study aims to determine the effect of NPF on net income in Islamic commercial banks. This study uses a quantitative approach to the type of descriptive research. The population in this study was 14 Islamic commercial banks listed on the Indonesian stock exchange from 2015-2019, while the sampling technique used was purposive sampling. The data analysis method used is simple regression analysis to test the effect of NPF on net income. Before the simple regression test, a prerequisite analysis test was conducted, which consisted of a normality test and a homogeneity test. Based on the data analysis results, it can be seen that tcount is -3.084 and the significant value is 0.009 <0.05 so that there is an influence between NPF and net income. From the research results, it can be concluded that the NPF variable influences the net income of 37.8% of state-owned Islamic banks during the 2015-2019 period.