James saves PhP10 for every PhP80 he has; if he receives PhP120 every day from Monday to Thursday, and it gets doubled every Friday, how much does he donate to Alay Kapwa?

Question

James saves $10 for every $80 he earns. If he earns $120 from Monday to Thursday, and gets doubled every Friday, how much does he donate to charity?

Answer 1

Mon to Thu he receives 4*120=$480. On Fri he receives $240 so in all he receives $720. This is equivalent to 720/80=9 amounts of $80, so he saves 9*10=$90 during a week. If he donates the savings to charity he donates $90 a week.