pretty penny vs reasonable

pretty penny

noun
  • A considerable amount of money; a high price or a high income. 

reasonable

adj
  • Just; fair; agreeable to reason. 

  • Satisfactory. 

  • Not excessive or immoderate; within due limits; proper. 

  • Not expensive; fairly priced. 

How often have the words pretty penny and reasonable occurred in a corpus of books? (source: Google Ngram Viewer )