Discount = 28 % + 17 % + 6 % = 51 %
Since the price of the electronic sensor = $ 700. 38
b ) Total Discount allowed : 51 % of $ 700.38 = $ 357. 19
a) Net price : $ 700. 38 - $ 357.19 = $ 343.19
c ) Exact single rate that was allowed : 6 % of $ 700.38 = $ 42.02