For the data in the following table, compute the additive quarterly seasonal forecast model for the number of ice creams sold by the store with trend. Round your values for the coefficients of the model to one decimal place.

Quarter Number of Ice Creams

$12648$

$25906$

$36906$

$43868$

$12780$

$26201$

$37251$

$43984$

$12919$

$26635$

$37469$

$44223$

$13123$

$26900$

$37909$