Read and complete Case Study $3\mathrm{.}3-$ Logitech International S$.$S$.,$ found in your textbook on pages $150-153.$ Answer the following questions found in the case study. Please use complete sentences, proper grammar and a standard business professional format for your writing style.

a$.$ Common$-$size income statements $($attach as an Excel file$)$

b$.$ Effective tax rates $($include as part of your Excel file$)$

c$.$ Growth rates of sales and total operating costs. $($include as part of your Excel file$)$

d$.$ Provide a analysis and interpretation. This should include explanations for why trends have occurred. The minimum interpretation should be no less then $2$ paragraphs.