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2.3 Definition of Sales
Hery (2017: 11) said that sales are the total amount given to the customers for the sale of the merchandise sold by the company
either on credit or cash.

2.4 Definition of Gross Profit Margin
Hermanto (2015: 118) defined the Gross Profit Margin Ratio measured by dividing gross profit with sales so that it earns profit
for every rupiah of sale . This ratio used to measure the percentage of gross profit on net sales. This ratio is measured by reducing
net sales to cost of goods sold.

Herewith the formula:
Gross Profit Margin (GPM) = (Gross Profit) x 100%
Sales

3. RESEARCH METHOD

3.1 Research Site
The object of the research is PT. Perkebunan Nusantara III (Persero) in Jl. Sei Batang Hari No. 02 Simpang Tanjung, Medan
Sunggal.

3.2 Model of Research
The research model can be described as follows:

Liquidity (CS)

Capital Structure (DER) Gross Profit Margin (GPM)

Sales (SALES)

Picture 3.1 Model of Research

The model and method used in this study is a descriptive method using multiple linear regression equations with the following
formula:
Y = α + β 1X1 + β 2X2 + β3X3+ε
Information :
Y = GPM
X1 = CS
X2 = DER
X3 = SALES
α = Constanta
ε = Error

3.3 Research Design
This research design uses quantitative descriptive

3.4 Data Collection Technique
This study uses the following data collection techniques:
1. Observation: by direct observations on the object of research.
2. Documentation: by financial statement obtained from the company.
3. Interview: by interviewing the company's finance department.

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