No because the extra 10% is off the discounted price, not the original. image that the CD originally cost $10. 15% off of the CD would make the price $8.50. Another 10% off of $8.50 would make the price that you have to pay $7.65. 25% off of the original price of $10 would make the price $7.50. Sorry if its a bit confusing but I hope that helps!
The angle of elevation is 26.565 (3dp) let h be the end height of the ramp above the ground , l be the length of the ramp and the angle of elevation is (30) i'm not sure, sorry