It is hard, but only if you try to find the general solution. If instead you think in the way the problem designer (who had a target audience of 3rd graders in mind) intended the solution to be found, then it becomes easy to find a solution: one of each toy from the yo-yo to the car (inclusive). That gets you $5.18 from the goal of $43.94, so get another car (the problem doesn't state you can't have repeats).
Interesting, if unsurprising, to see that a large factor in the interest in YouTube was based purely on location, as well as knowledge of the people working there, their backgrounds, and who specifically they were funded by.
Where you are and who you know often outweighs having the best product, features, etc.