5.3 Avoid function multiply, that receives an integer as a parameter and multiply it by two. The changed value is reflected in the calling program. (2) QUESTION 6 14 marks 6.1 All characters have an integer value associated with it called the ASCII value, for instance the ASCII value of 'A' is 65, ASCII value of B is 66 etc. What is the output of the following code? (4) #include using namespace std; int main( char c = 'A'; int letter = c + 1; cout using namespace std; (2) void calcVAT (float pricep, float & vatp) vat P = priceP * 0.15; 1 int main() { float vat, price - 100.00; calcVAT (price, vat); cout