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In which part of a VHDL code, the components are declared?

In which part of a VHDL code, the components are declared? Correct Answer Architecture

The components can only be declared after entity declaration. Thus component can be declared either in architecture or in package. If they are declared in package, then just include the package. No need to declare it again.

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A small and medium enterprise imports two components A and B from Taiwan and China respectively and assembles them with other components to form a toy. Components A contributes to 10% of production cost while components B contributes to 20% of production cost. Usually the company sells this toy at 20% above the production cost. Due to increase in the raw material and labour cost in both the countries ,component A became 20% costlier and components B became 40% costlier. Owing to these reasons the company increased its selling price by 15%. Considering that cost of other components does not change. What will be the profit percentage if the toy is sold at the new price?
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In which part of the VHDL code, components must be declared?
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