Raj attempts a typing test of 30 minutes. He starts with a speed of 35 wpm and types for the first ten minutes. Then, his hands start to flail, in the effort to maintain his speed he starts making errors. If in every minute following he makes \(14\frac{2}{7}\)% errors, find his speed at the end of 30 minutes.(approx.)Note: only number of words typed correctly is taken into account.