7.5. Zya decided to buy a crumblik. In the store, they also sold kryambliks. Zya bought a kryamblik and received coupons worth $50\%$ of the cost of the purchased kryamblik. With these coupons, he was able to pay $20\%$ of the cost of the crumblik. After paying the remaining amount, he bought the crumblik as well. By what percentage did Zya's expenses on buying the kryamblik and crumblik exceed the originally planned expenses for buying the crumblik?
7.5. From the condition of the problem, it follows that $50 \%$ of the cost of a kryamblik is equal to $20 \%$ of the cost of a krumblik. This means that the kryamblik constitutes $40 \%$ of the cost of the krumblik. Zya paid the full cost of the kryamblik and the remaining $80 \%$ of the cost of the krumblik. Thus, he paid $120 \%$ of the cost of the krumblik. Therefore, his expenses exceeded the initially planned expenses by $20 \%$.

Answer: $20 \%$.