Elmo has his heart set on being able to buy a new bike that cost $99 tax included by summer break that starts the first week of June. He started with $25 in his piggy bank and has been mowing for yards per month at a rate of one every weekend earning $10 per yard mowed. He has been putting his earnings in his piggy bank as soon as he earns it. It's mid May and he just learned how to solve applied math problems what month will he earn his money?