QUESTION PROVIDED IN ATTACH IMAGE KINDLY SEE. AND BELOW TEMPLATES PROVIDED CHECK THIS BEFORE MAKING SOLUTION ( main.cpp , fuel.cpp , petrol.cpp , liquid.cpp . ) -------------------Templates Below----------------------main.cpp template#include #include #include "Petrol.cpp"using namespace std;int main(){//fill your code here.return 0;} fuel.cpp template#include #includeusing namespace std;class Fuel{ //fill your code here }; petrol.cpp template#include #include #include "Liquid.cpp"#include "Fuel.cpp"using namespace std;class Petrol: public Liquid, public Fuel{ //fill your code here.}; liquid.cpp template#include #includeusing namespace std;class Liquid{//fill your code here}; Write a C++ program to implement multiple inheritance concepts and calculate the heat ofcombustion.Strictly adhere to the Object-Oriented specifncations given in the problem statement. All classnames, member variable names, and function names should be the same as specified in theproblem statement.Problem Constraint:Heat of combustion (9.-12400-2.100Where Q, is measured in calories per gram and dis the specific gravity at 60 "F (16 "C)The class Liquid has the following private data members.Data TypehoatVariable NamekpecifeGravityInclude necessary constructors, petters, and settersIn the Liquid class include the following member function.Function name DescriptionMold display This function is used to display the specitc gravityThe class Fuel has the following private data members.Data TypeloatVariable NamerateInclude necessary constructors petters, and settersIn the Fuel class, include the following member function.Function name DescriptionVold display This function is used to display the fuel rate per litreThe class Petrol derived from Lievid class and Fuel class has the following private data members.Data TypeloatstringVariable NameheatCombustiontypeInclude necessary constructors, petters, and settersIn the Petrol class, Include the following member functionFunction nameDescriptionThis function is used to calculate the heat of combustion using the following formulaHeat of combustion(QJ-12.400-2.100s.This function is used to display the heat of combustion value and to call the display functionin the base class Liquid and fuel. Display heat of combustion value with respect to two decimal places.Vold calculateHeatCombustionvold displayoIn the main method, get the specific pravity, fuel rate per titre, and petrol type from the user.Create an object for the derived class and call the derived class display method.Input and Output format:Refer sample input and output for formatting speciications.(AH Texts in bold corresponds to the input and the remaining corresponds to the output)Sample Input and Output:Enter the specific gravity0.7Enter fuel rate per litre:0.99Petrol typePremiumFuel Detals:Specinic gravity:0.7Fuel rate per liter:0.99Heat of combustion(Q1137100

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#include #include using namespace std; class Liquid{ private:…