Apple reports the following operating income (and average assets in parentheses) in a recent year for each of its geographic segments $ millions: Americas, $13,538 ($3,308); Europe, $ 11,528 ($2,456); and Japan, $2,481 ($898). Apple also reports the following sales (only) by product segments: iPhone, $47,057; iPad, $20,358; iPod, $7,453; Desktops, $6,439; Portables, $15,344; Other, $11,598. Compute Apple's return on assets for each of its geographic segments, and assess the relative performance of these segments. Compute the percentage of total sales for each of its five product segments.