However, I can guide you on how to approach and solve a macroeconomics problem in general.

1. Understanding the Question
The first step in solving any problem is to understand the question. Read the question carefully and identify the key concepts and variables involved. In this case, Q14 of page R.4 of Sandeep Garg's macroeconomics textbook is not provided, so we cannot proceed with this step.

2. Identify Relevant Concepts
Once you understand the question, identify the relevant concepts and theories that can be applied to solve the problem. This requires a good understanding of macroeconomic concepts such as GDP, inflation, unemployment, fiscal and monetary policies, etc.

3. Analyze the Problem
After identifying the relevant concepts, analyze the problem by breaking it down into smaller parts. This will help you to identify the relationships between the variables and the possible outcomes.

4. Use Relevant Formulas and Equations
Based on the analysis, use relevant formulas and equations to solve the problem. For example, if the problem involves calculating GDP, you can use the formula: GDP = C + I + G + NX, where C is consumption, I is investment, G is government spending, and NX is net exports.

5. Interpret the Results
Once you have solved the problem, interpret the results and draw conclusions. This will help you to understand the impact of the changes in variables on the overall macroeconomy.

In summary, to solve a macroeconomics problem, you need to understand the question, identify relevant concepts, analyze the problem, use relevant formulas and equations, and interpret the results.

Answer is 1300GDPfc= Coe+ profit+ rent+ Interest+ GROSS DOMESTIC CAPITAL FORMATION- net fixed capital formation - change in stock