public class Calculator {

public double calculate(int pplCount,double amountReceipt){

double result = amountReceipt/(double) pplCount;

return mathFloor(result);

}

public double conversionSum(double price){

return mathFloor(price);

}

double mathFloor(double sum){

return Math.floor(100*sum)/100.0;

}

public String formatSum(double price){

int partOfPrice = ((int) price) % 100;

if (Double.compare(partOfPrice,14)>0) {

partOfPrice = ((int) partOfPrice) % 10;

}

String nameRub = "";

switch (partOfPrice){

case 1:

nameRub = "рубль";

break;

case 2:

case 3:

case 4:

nameRub = "рубля";

break;

default:

nameRub = "рублей";

}

return String.format("%.2f %s",price, nameRub);

}

}