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During Christmas last year, a church was illuminated using some red and yellow coloured light bulbs.
There were 400 more red than yellow bulbs.
This year, the church plans to use 10% less red bulbs and increase the number of yellow bulbs by 20%.
It plans to put up 1179 bulbs in all this year.
(a) How many red bulbs will be put up this year?
(b) If the cost of 1 bulb is 80 cents, what was the total cost of all the bulbs used last year?
Notes to students:
- If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12