Here we use the following notations:

• SI — sources of income;
• PPI — payback period of investment.

     General properties of this type tasks:

• physical nature of SI — any possible;
• diversity of SI profitability — fixed;
• payback factor — return on investment;
• option of SI behavior on initial ranges of their exploitation:
  • changing specific income from exploitation (option 1);
  • random delay of the start of exploitation (option 2);
• the need for statistical modeling:
  • for option 1 — not is;
  • for option 2 — is.

     Variant of task statement for option 1:

• number of investment options, for each of them are given:
  • investment amount, which consists of two parts:
    • investor's own funds;
    • credit funds, involved by him;
• interest rate on the loan;
• payback parameters:
  • PPI;
  • rate of return during PPI on the consumed investment amount;
• number of SI types, for each of them are given:
  • SI sample description;
  • minimum and permissible numbers of being acquired SI samples;
  • cost of one SI;
  • expected specific income (per time unit) from exploiting one SI in stationary mode;
  • number of points of a tabular function of reduction ratio for specific income from SI non-stationary exploitation, for each of them are given:
    • value of argument: a current time of SI exploitation;
    • value of function.

     Variant of task statement for option 2:

• investment amount, which consists of two parts:
  • investor's own funds;
  • credit funds, involved by him;
• interest rate on the loan;
• payback parameters:
  • PPI;
  • maximum and minimum values of a rate of return during PPI on the consumed investment amount;
  • number of its values;
• number of SI types, for each of them are given:
  • SI sample description;
  • minimum and permissible numbers of being acquired SI samples;
  • cost of one SI;
  • expected specific income from exploiting one SI in stationary mode;
  • number of points of a tabular function of distributing a random delay of the start of SI exploitation, for each of them are given:
    • value of argument: a current time of owning SI;
    • value of function.

     Maximized quality criterion: relative income (per time unit) from SI exploitation.