Fill in the missing information in the following table. Assume that Portfolio $AB$ is $70$ percent invested in Stock $A.($ A negative value should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to $2$ decimal places.$)$

Answer is not complete.

$\backslash$table$[[$Annual Returns on Stocks A and B$],[$Year$,$Stock $A,,$Stock B$,,$Portfolio AB$,],[2015,12\mathrm{.}5,\%,22\mathrm{.}5,\%,15\mathrm{.}50,\%$