(a) An English textbook costs GHc 25.00. The author of the book agreed to take 20% of the cost of each book sold. If 1,702 copies were sold, calculate the author’s share.

(b) Simplify: ${({2/15}+{2/5})}+{({9/10}*{4/3})}*{({1/5}÷{1/4})}$

c.
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In the diagram, |MN| = 13 cm, |MP| = 15 cm, |MN | = 12 cm and is perpendicular to |NP| . Calculate length |NP|